TY  - JOUR
AU  - Mitrović, Branislava
AU  - Todorović, Dragana
AU  - Ajtić, Jelena
AU  - Vranješ, Borjana
PY  - 2020
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1794
AB  - This review paper discusses the content of natural ( 40K, 238U, 226Ra, and 232Th) and artificial (137Cs) radionuclides in the soil of the mountains of Maljen, Tara and Kopaonik in the Republic of Serbia over 2002-2015. In addition, the paper gives radiation hazard parameters, i.e., radium equivalent activity, absorbed dose rate, annual effective dose equivalent, external hazard index, annual gonadal dose equivalent, and excess lifetime cancer risk outdoors that we calculated from the obtained content of the natural radionuclides in the soil samples. We compared the parameters to previously published results for different parts of the country and looked into the radioecological status of the investigated areas.
AB  - U radu su prikazani rezultati gamaspektrometrijskog određivanja sadržaja prirodnih (40K, 238U, 226Ra i 232Th) i proizvedenog (137Cs) radionuklida u zemljištu sa područja planina Maljen, Tara i Kopaonik. Uzorci zemljišta prikupljeni su u periodu od 2002. do 2015. godine na različitim nadmorskim visinama. Na osnovu sadržaja radionuklida u zemljištu odredili smo parametre radijacionog rizika: radijum ekvivalentnu aktivnost, jačinu doze, godišnju efektivnu dozu spoljašnjeg zračenja, indeks spoljašnjeg hazarda, godišnju gonadnu dozu i faktor rizika pojave kancera na području planinskih regiona Republike Srbije, i potom ih uporedili sa ranije objavljenim rezultatima za pojedine regione Republike Srbije.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd
T2  - Journal of Agricultural Sciences (Belgrade)
T1  - A review: Natural and artificial radionuclides and radiation hazard parameters in the soil of mountain regions in Serbia
T1  - Prirodni i proizvedeni radionuklidi u zemljištu planinskih regiona Republike Srbije i parametri radijacionog rizika
VL  - 65
IS  - 1
SP  - 1
EP  - 18
DO  - 10.2298/JAS2001001M
ER  - 

@article{
author = "Mitrović, Branislava and Todorović, Dragana and Ajtić, Jelena and Vranješ, Borjana",
year = "2020",
abstract = "This review paper discusses the content of natural ( 40K, 238U, 226Ra, and 232Th) and artificial (137Cs) radionuclides in the soil of the mountains of Maljen, Tara and Kopaonik in the Republic of Serbia over 2002-2015. In addition, the paper gives radiation hazard parameters, i.e., radium equivalent activity, absorbed dose rate, annual effective dose equivalent, external hazard index, annual gonadal dose equivalent, and excess lifetime cancer risk outdoors that we calculated from the obtained content of the natural radionuclides in the soil samples. We compared the parameters to previously published results for different parts of the country and looked into the radioecological status of the investigated areas., U radu su prikazani rezultati gamaspektrometrijskog određivanja sadržaja prirodnih (40K, 238U, 226Ra i 232Th) i proizvedenog (137Cs) radionuklida u zemljištu sa područja planina Maljen, Tara i Kopaonik. Uzorci zemljišta prikupljeni su u periodu od 2002. do 2015. godine na različitim nadmorskim visinama. Na osnovu sadržaja radionuklida u zemljištu odredili smo parametre radijacionog rizika: radijum ekvivalentnu aktivnost, jačinu doze, godišnju efektivnu dozu spoljašnjeg zračenja, indeks spoljašnjeg hazarda, godišnju gonadnu dozu i faktor rizika pojave kancera na području planinskih regiona Republike Srbije, i potom ih uporedili sa ranije objavljenim rezultatima za pojedine regione Republike Srbije.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd",
journal = "Journal of Agricultural Sciences (Belgrade)",
title = "A review: Natural and artificial radionuclides and radiation hazard parameters in the soil of mountain regions in Serbia, Prirodni i proizvedeni radionuklidi u zemljištu planinskih regiona Republike Srbije i parametri radijacionog rizika",
volume = "65",
number = "1",
pages = "1-18",
doi = "10.2298/JAS2001001M"
}

Mitrović, B., Todorović, D., Ajtić, J.,& Vranješ, B.. (2020). A review: Natural and artificial radionuclides and radiation hazard parameters in the soil of mountain regions in Serbia. in Journal of Agricultural Sciences (Belgrade)
Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd., 65(1), 1-18.
https://doi.org/10.2298/JAS2001001M

Mitrović B, Todorović D, Ajtić J, Vranješ B. A review: Natural and artificial radionuclides and radiation hazard parameters in the soil of mountain regions in Serbia. in Journal of Agricultural Sciences (Belgrade). 2020;65(1):1-18.
doi:10.2298/JAS2001001M .

Mitrović, Branislava, Todorović, Dragana, Ajtić, Jelena, Vranješ, Borjana, "A review: Natural and artificial radionuclides and radiation hazard parameters in the soil of mountain regions in Serbia" in Journal of Agricultural Sciences (Belgrade), 65, no. 1 (2020):1-18,
https://doi.org/10.2298/JAS2001001M . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Nečemer, Marijan
AU  - Todorović, Dragana
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Djurdjević, Vladimir
AU  - Vodenik, Branko
AU  - Glavič Cindro, Denis
AU  - Kožar Logar, Jasmina
AU  - Zorko, Benjamin
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2342
AB  - Activity concentrations of cosmogenic beryllium-7, terragenic lead-210 and artificial caesium-137
are closely observed within environmental radioactivity monitoring programmes in Serbia and
Slovenia. In this study, we compare the temporal evolution and seasonal cycles of the radionuclides
recorded over 1991–2015 in three locations: Belgrade (44.88333 °N; 20.583333 °E; 95 m a.s.l.), the
capital of the Republic of Serbia; Krško (45.950414 °N; 15.512261 °E; 204 m a.s.l.), a town in eastern
Slovenia, located ~400 km west of Belgrade; and Ljubljana (46.042356 °N; 14.487494 °E;
292 m a.s.l.), the capital of the Republic of Slovenia, located ~500 km west of Belgrade. The latitudes
of these three sites differ only slightly, approximately by 1°.
The similarities between the data sets are evident from their measurement ranges and long-term
means. For example, the recorded beryllium-7 activity concentrations fall within the ranges reported
for different locations in Europe. In the lead-210 series, the observed values are similar to the activity
concentrations reported for some neighbouring regions, but around twofold higher than in locations
that are under a significant maritime influence, thus removed from this radionuclide’s source. The
activity concentrations of caesium-137 at all the sites are of the same order of magnitude and agree
with the post-Chernobyl picture of the fall-out in Europe.
However, there are some noticeable differences in the seasonal cycles of these radionuclides at
the investigated sites. For example, even though the beryllium-7 seasonal cycles in all the sites exhibit
a spring/summer maximum and a winter minimum, the timing of the maximum recorded at the
Slovenian sites is agreement with other Western European sites of similar latitude in contrast to the
Belgrade site that shows an earlier occurrence of the maximum, more in line with European locations
further north.
A possible explanation for the observed dissimilarities could lie in the differences of the
meteorological patterns in the investigated sites. According to Köppen-Geiger climate classification,
Krško and Ljubljana have Warm temperate fully humid climate with warm summers (Cfb), while
Belgrade is characterised by Warm temperate fully humid climate with hot summers (Cfa). Belgrade
is located deeper in the continental landmass, and its climate has more of midlatitude continental
characteristics, in terms of higher summer temperature, more pronounced seasonal temperature
amplitude, and lower precipitation, especially during summer months. These differences in climate
affect the transport and removal of the radionuclides from the atmosphere and could lead to the
observed dissimilarities. Still, a detailed analysis of the radionuclides’ time series and their relation to
the time series of the meteorological parameters is needed to better understand their interconnexion.
PB  - Niš : Sievert Association
C3  - Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija
T1  - Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia
SP  - 27
EP  - 27
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2342
ER  - 

@conference{
author = "Ajtić, Jelena and Sarvan, Darko and Nečemer, Marijan and Todorović, Dragana and Rajačić, Milica and Krneta Nikolić, Jelena and Djurdjević, Vladimir and Vodenik, Branko and Glavič Cindro, Denis and Kožar Logar, Jasmina and Zorko, Benjamin",
year = "2019",
abstract = "Activity concentrations of cosmogenic beryllium-7, terragenic lead-210 and artificial caesium-137
are closely observed within environmental radioactivity monitoring programmes in Serbia and
Slovenia. In this study, we compare the temporal evolution and seasonal cycles of the radionuclides
recorded over 1991–2015 in three locations: Belgrade (44.88333 °N; 20.583333 °E; 95 m a.s.l.), the
capital of the Republic of Serbia; Krško (45.950414 °N; 15.512261 °E; 204 m a.s.l.), a town in eastern
Slovenia, located ~400 km west of Belgrade; and Ljubljana (46.042356 °N; 14.487494 °E;
292 m a.s.l.), the capital of the Republic of Slovenia, located ~500 km west of Belgrade. The latitudes
of these three sites differ only slightly, approximately by 1°.
The similarities between the data sets are evident from their measurement ranges and long-term
means. For example, the recorded beryllium-7 activity concentrations fall within the ranges reported
for different locations in Europe. In the lead-210 series, the observed values are similar to the activity
concentrations reported for some neighbouring regions, but around twofold higher than in locations
that are under a significant maritime influence, thus removed from this radionuclide’s source. The
activity concentrations of caesium-137 at all the sites are of the same order of magnitude and agree
with the post-Chernobyl picture of the fall-out in Europe.
However, there are some noticeable differences in the seasonal cycles of these radionuclides at
the investigated sites. For example, even though the beryllium-7 seasonal cycles in all the sites exhibit
a spring/summer maximum and a winter minimum, the timing of the maximum recorded at the
Slovenian sites is agreement with other Western European sites of similar latitude in contrast to the
Belgrade site that shows an earlier occurrence of the maximum, more in line with European locations
further north.
A possible explanation for the observed dissimilarities could lie in the differences of the
meteorological patterns in the investigated sites. According to Köppen-Geiger climate classification,
Krško and Ljubljana have Warm temperate fully humid climate with warm summers (Cfb), while
Belgrade is characterised by Warm temperate fully humid climate with hot summers (Cfa). Belgrade
is located deeper in the continental landmass, and its climate has more of midlatitude continental
characteristics, in terms of higher summer temperature, more pronounced seasonal temperature
amplitude, and lower precipitation, especially during summer months. These differences in climate
affect the transport and removal of the radionuclides from the atmosphere and could lead to the
observed dissimilarities. Still, a detailed analysis of the radionuclides’ time series and their relation to
the time series of the meteorological parameters is needed to better understand their interconnexion.",
publisher = "Niš : Sievert Association",
journal = "Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija",
title = "Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia",
pages = "27-27",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2342"
}

Ajtić, J., Sarvan, D., Nečemer, M., Todorović, D., Rajačić, M., Krneta Nikolić, J., Djurdjević, V., Vodenik, B., Glavič Cindro, D., Kožar Logar, J.,& Zorko, B.. (2019). Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia. in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija
Niš : Sievert Association., 27-27.
https://hdl.handle.net/21.15107/rcub_veterinar_2342

Ajtić J, Sarvan D, Nečemer M, Todorović D, Rajačić M, Krneta Nikolić J, Djurdjević V, Vodenik B, Glavič Cindro D, Kožar Logar J, Zorko B. Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia. in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija. 2019;:27-27.
https://hdl.handle.net/21.15107/rcub_veterinar_2342 .

Ajtić, Jelena, Sarvan, Darko, Nečemer, Marijan, Todorović, Dragana, Rajačić, Milica, Krneta Nikolić, Jelena, Djurdjević, Vladimir, Vodenik, Branko, Glavič Cindro, Denis, Kožar Logar, Jasmina, Zorko, Benjamin, "Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia" in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija (2019):27-27,
https://hdl.handle.net/21.15107/rcub_veterinar_2342 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Zorko, Benjamin
AU  - Todorović, Dragana
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2344
AB  - Since 2015, a scientific collaboration network between the University of Belgrade, the University
of Bologna and the Radioactive Monitoring Environmental (REM) group of the European
Commission Joint Research Centre – Ispra, has addressed the characterisation of the beryllium-7
concentration in the surface air recorded across Europe, and its link with meteorological conditions.
A set of studies carried out over this period has been based on the beryllium-7 activity measurements
collected and validated by the Radioactivity Monitoring Environmental Data Bank (REMdb)
(https://rem.jrc.ec.europa.eu/RemWeb/Index.aspx). REMdb makes accessible and understandable
to a wider audience radioactivity measurements made by all European Member States in the air,
water, milk, and mixed diet. Thus, the scientific community is given research opportunities to exploit
a unique collection of almost 5 million environmental radioactivity measurements taken across
Europe since 1988. Our collaboration has also investigated other sets of multidecadal beryllium-7
activity concentrations: 1) sampled in Serbia and measured at the Vinča Institute of Nuclear Sciences,
and 2) sampled in Slovenia and measured at the Jožef Stefan Institute.
This paper compiles our current understanding of the abundance of beryllium-7, which is a
naturally occurring radionuclide, in the surface air in Europe. Beryllium-7 is produced in the upper
troposphere-lower stratosphere (UT-LS) region, where it attaches to fine aerosols and is then
transported through the atmosphere. Due to its origin, it is considered a good tracer of air mass
history, and it can be used as an indicator of different processes in the atmosphere, such as vertical
exchange across the UT-LS region. Based on a number of our previous studies, we here give an
overall picture of the beryllium-7 activity concentration distribution in Europe. We describe its
general decrease from the south of the continent towards the polar region, different periodicities and
outliers identified in the time series, and we make an effort to identify the underlying driving
mechanisms that give rise to this distribution. We also look into temporal trends that show a
statistically significant increase in the beryllium-7 surface concentration. Since temperature is one of
the major factors that influence this radionuclide’s abundance in the air, we speculate that the trends
are affected by the global increase in temperature. For that reason, we intend to further inquire into
the possibility of using the beryllium-7 surface concentration as an indicator of climate change.
PB  - Niš : RAD Centre
C3  - Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro
T1  - Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe
SP  - 9
EP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2344
ER  - 

@conference{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Zorko, Benjamin and Todorović, Dragana",
year = "2019",
abstract = "Since 2015, a scientific collaboration network between the University of Belgrade, the University
of Bologna and the Radioactive Monitoring Environmental (REM) group of the European
Commission Joint Research Centre – Ispra, has addressed the characterisation of the beryllium-7
concentration in the surface air recorded across Europe, and its link with meteorological conditions.
A set of studies carried out over this period has been based on the beryllium-7 activity measurements
collected and validated by the Radioactivity Monitoring Environmental Data Bank (REMdb)
(https://rem.jrc.ec.europa.eu/RemWeb/Index.aspx). REMdb makes accessible and understandable
to a wider audience radioactivity measurements made by all European Member States in the air,
water, milk, and mixed diet. Thus, the scientific community is given research opportunities to exploit
a unique collection of almost 5 million environmental radioactivity measurements taken across
Europe since 1988. Our collaboration has also investigated other sets of multidecadal beryllium-7
activity concentrations: 1) sampled in Serbia and measured at the Vinča Institute of Nuclear Sciences,
and 2) sampled in Slovenia and measured at the Jožef Stefan Institute.
This paper compiles our current understanding of the abundance of beryllium-7, which is a
naturally occurring radionuclide, in the surface air in Europe. Beryllium-7 is produced in the upper
troposphere-lower stratosphere (UT-LS) region, where it attaches to fine aerosols and is then
transported through the atmosphere. Due to its origin, it is considered a good tracer of air mass
history, and it can be used as an indicator of different processes in the atmosphere, such as vertical
exchange across the UT-LS region. Based on a number of our previous studies, we here give an
overall picture of the beryllium-7 activity concentration distribution in Europe. We describe its
general decrease from the south of the continent towards the polar region, different periodicities and
outliers identified in the time series, and we make an effort to identify the underlying driving
mechanisms that give rise to this distribution. We also look into temporal trends that show a
statistically significant increase in the beryllium-7 surface concentration. Since temperature is one of
the major factors that influence this radionuclide’s abundance in the air, we speculate that the trends
are affected by the global increase in temperature. For that reason, we intend to further inquire into
the possibility of using the beryllium-7 surface concentration as an indicator of climate change.",
publisher = "Niš : RAD Centre",
journal = "Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro",
title = "Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe",
pages = "9-9",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2344"
}

Ajtić, J., Djurdjević, V., Sarvan, D., Brattich, E., Hernández-Ceballos, M. A., Zorko, B.,& Todorović, D.. (2019). Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe. in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro
Niš : RAD Centre., 9-9.
https://hdl.handle.net/21.15107/rcub_veterinar_2344

Ajtić J, Djurdjević V, Sarvan D, Brattich E, Hernández-Ceballos MA, Zorko B, Todorović D. Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe. in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro. 2019;:9-9.
https://hdl.handle.net/21.15107/rcub_veterinar_2344 .

Ajtić, Jelena, Djurdjević, Vladimir, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Zorko, Benjamin, Todorović, Dragana, "Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe" in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro (2019):9-9,
https://hdl.handle.net/21.15107/rcub_veterinar_2344 .

TY  - CONF
AU  - Sarvan, Darko
AU  - Todorović, Dragana
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Djurdjević, Vladimir
AU  - Zorko, Benjamin
AU  - Vodenik, Branko
AU  - Glavič Cindro, Denis
AU  - Kožar Logar, Jasmina
AU  - Ajtić, Jelena
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2346
AB  - Cosmogenic beryllium-7 (Be-7) and a long-lived radon progeny lead-210 (Pb-210) are radionuclides commonly measured in the environmental radioactivity programmes. Although their production mechanisms and points of entry into the atmosphere differ, there is a strong interconnection between their behaviour since they are transported through the atmosphere attached to aerosols. Thus, their abundance is governed by the atmospheric processes and both are considered good tracers of air mass origin. In this paper, we use the Be-7and Pb-210 specific activities measured in Serbia and Slovenia to investigate the degree of their similarities across a distance of about 500 km. Specifically, in an attempt to distinguish major influencing mechanisms, we apply factor analysis to the radionuclides’ measurements conducted over 1991–2015 in Belgrade, Serbia, and Ljubljana and Krško, both in Slovenia. The factor analysis also includes the following meteorological parameters at each sampling site: temperature, cloud cover, relative humidity, precipitation and atmospheric pressure (not available at the Krško site). The results of the factor analysis show that the communalities of only two factors are already larger than 0.5 for most of the variables. The exceptions are the atmospheric pressure in Belgrade and precipitation in both Belgrade and Ljubljana. The factor loadings of two factors show that: 1) the Be-7 specific activity, temperature, cloud cover and relative humidity are encompassed by factor 1 in all the sites; while 2) the Pb-210 specific activity is described by factor 2 together with atmospheric pressure in Belgrade and Ljubljana, but with precipitation in Krško (where atmospheric pressure is not available). These results imply that the Be-7 and Pb-210 are under different dominant underlying mechanisms. Over the investigated 24 years, both the Be-7 and Pb-210 measurements across the three sites show a very good agreement in the measurement ranges and overall means. However, a closer examination of the differences in the data time series reveal an exception to this general agreement – during 2005– 2012, there is a pronounced increase in radionuclides’ concentrations in Ljubljana and Krško, relative to Belgrade. Therefore, factor analysis is also performed for this shorter time period. The obtained factor loadings show a change in the influence of the major two factors. Compared to 1991–2015, the influence of factor 2 on Be-7 increases in Belgrade and decreases in Ljubljana. On the other hand, an influence of factor 1 on Pb-210 decreases in Belgrade, but increases in Ljubljana and Krško. These opposing changes might explain the relatively high differences in the radionuclides’ concentrations seen over 2005–2012.
PB  - Niš : RAD Association
C3  - 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
T1  - Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015
SP  - 185
EP  - 185
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2346
ER  - 

@conference{
author = "Sarvan, Darko and Todorović, Dragana and Rajačić, Milica and Krneta Nikolić, Jelena and Djurdjević, Vladimir and Zorko, Benjamin and Vodenik, Branko and Glavič Cindro, Denis and Kožar Logar, Jasmina and Ajtić, Jelena",
year = "2018",
abstract = "Cosmogenic beryllium-7 (Be-7) and a long-lived radon progeny lead-210 (Pb-210) are radionuclides commonly measured in the environmental radioactivity programmes. Although their production mechanisms and points of entry into the atmosphere differ, there is a strong interconnection between their behaviour since they are transported through the atmosphere attached to aerosols. Thus, their abundance is governed by the atmospheric processes and both are considered good tracers of air mass origin. In this paper, we use the Be-7and Pb-210 specific activities measured in Serbia and Slovenia to investigate the degree of their similarities across a distance of about 500 km. Specifically, in an attempt to distinguish major influencing mechanisms, we apply factor analysis to the radionuclides’ measurements conducted over 1991–2015 in Belgrade, Serbia, and Ljubljana and Krško, both in Slovenia. The factor analysis also includes the following meteorological parameters at each sampling site: temperature, cloud cover, relative humidity, precipitation and atmospheric pressure (not available at the Krško site). The results of the factor analysis show that the communalities of only two factors are already larger than 0.5 for most of the variables. The exceptions are the atmospheric pressure in Belgrade and precipitation in both Belgrade and Ljubljana. The factor loadings of two factors show that: 1) the Be-7 specific activity, temperature, cloud cover and relative humidity are encompassed by factor 1 in all the sites; while 2) the Pb-210 specific activity is described by factor 2 together with atmospheric pressure in Belgrade and Ljubljana, but with precipitation in Krško (where atmospheric pressure is not available). These results imply that the Be-7 and Pb-210 are under different dominant underlying mechanisms. Over the investigated 24 years, both the Be-7 and Pb-210 measurements across the three sites show a very good agreement in the measurement ranges and overall means. However, a closer examination of the differences in the data time series reveal an exception to this general agreement – during 2005– 2012, there is a pronounced increase in radionuclides’ concentrations in Ljubljana and Krško, relative to Belgrade. Therefore, factor analysis is also performed for this shorter time period. The obtained factor loadings show a change in the influence of the major two factors. Compared to 1991–2015, the influence of factor 2 on Be-7 increases in Belgrade and decreases in Ljubljana. On the other hand, an influence of factor 1 on Pb-210 decreases in Belgrade, but increases in Ljubljana and Krško. These opposing changes might explain the relatively high differences in the radionuclides’ concentrations seen over 2005–2012.",
publisher = "Niš : RAD Association",
journal = "6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia",
title = "Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015",
pages = "185-185",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2346"
}

Sarvan, D., Todorović, D., Rajačić, M., Krneta Nikolić, J., Djurdjević, V., Zorko, B., Vodenik, B., Glavič Cindro, D., Kožar Logar, J.,& Ajtić, J.. (2018). Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
Niš : RAD Association., 185-185.
https://hdl.handle.net/21.15107/rcub_veterinar_2346

Sarvan D, Todorović D, Rajačić M, Krneta Nikolić J, Djurdjević V, Zorko B, Vodenik B, Glavič Cindro D, Kožar Logar J, Ajtić J. Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia. 2018;:185-185.
https://hdl.handle.net/21.15107/rcub_veterinar_2346 .

Sarvan, Darko, Todorović, Dragana, Rajačić, Milica, Krneta Nikolić, Jelena, Djurdjević, Vladimir, Zorko, Benjamin, Vodenik, Branko, Glavič Cindro, Denis, Kožar Logar, Jasmina, Ajtić, Jelena, "Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015" in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia (2018):185-185,
https://hdl.handle.net/21.15107/rcub_veterinar_2346 .

TY  - CONF
AU  - Zorko, Benjamin
AU  - Ajtić, Jelena
AU  - Vodenik, Branko
AU  - Glavič Cindro, Denis
AU  - Rajačić, Milica
AU  - Petrovič, Toni
AU  - Krneta-Nikolić, Jelena D.
AU  - Janković, Marija M.
AU  - Sarap, Nataša
AU  - Vukanac, Ivana
AU  - Pantelić, Gordana K.
AU  - Todorović, Dragana
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2345
AB  - The isotopes of ruthenium (Ru-106, Ru-103) were detected by several European environmental networks involved in the monitoring of atmospheric radioactive contamination in late September 2017. The radioactive cloud passed over the countries in the east and south-east of Europe, while other countries in Europe were just brushed up with very low activity concentrations of Ru-106. Ruthenium is very rare and hence its presence may suggest that an event of some nature occurred. Ruthenium-106 is a fission product from the nuclear industry and it is also used in medical procedures, such as brachytherapy treatments. Ruthenium-106 is a beta emitter with a half-life of 1.02 year so the isotopic presence may persist for some time, with its duration depending on many factors. Apart from the disintegration of Ru-106 to the ground state of a short-lived Rh-106, some characteristic gamma rays are emitted. The origin of Ru-106 in the atmosphere is still unclear. Among the countries that were affected by the passage of the radioactive cloud containing isotopes of ruthenium were the Republic of Slovenia and Republic of Serbia. The activity concentrations of Ru106 in the air detected in several stations of both countries were of a similar magnitude. The activity concentrations were determined by standard gamma spectrometry measurements at the Vinča Institute of Nuclear Sciences and Jožef Stefan Institute for the Serbian and Slovenian sampling sites, respectively. Ruthenium was also detected in trace levels in other environmental media (precipitation). Several statistical calculations to compare measurement results in Slovenia and Serbia are carried out. Those calculations also take into account other radionuclides, such as cosmogenic beryllium-7 and a long-lived radon progeny lead-210, to investigate possible atmospheric processes accompanying the release of ruthenium.
PB  - Niš : RAD Association
C3  - 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
T1  - Comparison of concentration activities of ruthenium isotopes measured over Slovenia and Serbia
SP  - 193
EP  - 193
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2345
ER  - 

@conference{
author = "Zorko, Benjamin and Ajtić, Jelena and Vodenik, Branko and Glavič Cindro, Denis and Rajačić, Milica and Petrovič, Toni and Krneta-Nikolić, Jelena D. and Janković, Marija M. and Sarap, Nataša and Vukanac, Ivana and Pantelić, Gordana K. and Todorović, Dragana",
year = "2018",
abstract = "The isotopes of ruthenium (Ru-106, Ru-103) were detected by several European environmental networks involved in the monitoring of atmospheric radioactive contamination in late September 2017. The radioactive cloud passed over the countries in the east and south-east of Europe, while other countries in Europe were just brushed up with very low activity concentrations of Ru-106. Ruthenium is very rare and hence its presence may suggest that an event of some nature occurred. Ruthenium-106 is a fission product from the nuclear industry and it is also used in medical procedures, such as brachytherapy treatments. Ruthenium-106 is a beta emitter with a half-life of 1.02 year so the isotopic presence may persist for some time, with its duration depending on many factors. Apart from the disintegration of Ru-106 to the ground state of a short-lived Rh-106, some characteristic gamma rays are emitted. The origin of Ru-106 in the atmosphere is still unclear. Among the countries that were affected by the passage of the radioactive cloud containing isotopes of ruthenium were the Republic of Slovenia and Republic of Serbia. The activity concentrations of Ru106 in the air detected in several stations of both countries were of a similar magnitude. The activity concentrations were determined by standard gamma spectrometry measurements at the Vinča Institute of Nuclear Sciences and Jožef Stefan Institute for the Serbian and Slovenian sampling sites, respectively. Ruthenium was also detected in trace levels in other environmental media (precipitation). Several statistical calculations to compare measurement results in Slovenia and Serbia are carried out. Those calculations also take into account other radionuclides, such as cosmogenic beryllium-7 and a long-lived radon progeny lead-210, to investigate possible atmospheric processes accompanying the release of ruthenium.",
publisher = "Niš : RAD Association",
journal = "6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia",
title = "Comparison of concentration activities of ruthenium isotopes measured over Slovenia and Serbia",
pages = "193-193",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2345"
}

Zorko, B., Ajtić, J., Vodenik, B., Glavič Cindro, D., Rajačić, M., Petrovič, T., Krneta-Nikolić, J. D., Janković, M. M., Sarap, N., Vukanac, I., Pantelić, G. K.,& Todorović, D.. (2018). Comparison of concentration activities of ruthenium isotopes measured over Slovenia and Serbia. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
Niš : RAD Association., 193-193.
https://hdl.handle.net/21.15107/rcub_veterinar_2345

Zorko B, Ajtić J, Vodenik B, Glavič Cindro D, Rajačić M, Petrovič T, Krneta-Nikolić JD, Janković MM, Sarap N, Vukanac I, Pantelić GK, Todorović D. Comparison of concentration activities of ruthenium isotopes measured over Slovenia and Serbia. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia. 2018;:193-193.
https://hdl.handle.net/21.15107/rcub_veterinar_2345 .

Zorko, Benjamin, Ajtić, Jelena, Vodenik, Branko, Glavič Cindro, Denis, Rajačić, Milica, Petrovič, Toni, Krneta-Nikolić, Jelena D., Janković, Marija M., Sarap, Nataša, Vukanac, Ivana, Pantelić, Gordana K., Todorović, Dragana, "Comparison of concentration activities of ruthenium isotopes measured over Slovenia and Serbia" in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia (2018):193-193,
https://hdl.handle.net/21.15107/rcub_veterinar_2345 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Todorović, Dragana
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Djurdjević, Vladimir
AU  - Zorko, Benjamin
AU  - Vodenik, Branko
AU  - Cindro Glavič, Denis
AU  - Jasmina, Kožar Logar
PY  - 2017
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2438
AB  - Beryllium-7 is a natural radionuclide produced in spallation processes in the upper troposphere
and lower stratosphere. Descent through the atmosphere brings this isotope to the lower altitudes and
its abundance at the surface is a result of an interplay between transport and removal processes, both
of which are influenced by local meteorological parameters.
In this analysis we use the beryllium-7 specific activities measured in three locations to investigate
spatial similarities and differences in the data sets. The measurement sites are: Belgrade, the capital of
Serbia; Ljubljana, the capital of Slovenia, located around 500 km west of Belgrade; and Krško, a town
in eastern Slovenia, located around 400 km west of Belgrade. The beryllium-7 measurements in Serbia
and Slovenia started in 1991 and 1988, respectively. The specific activities were determined by standard
gamma spectrometry at the Vinča Institute (Serbia) and Jožef Stefan Institute (Slovenia).
PB  - RAD Association
C3  - Fifth International Conference on Radiation and Applications in Various Fields of Research, RAD 2017, 12.06 - 16.06. Budva, Montenegro
T1  - Beryllium-7 in surface air–Multidecadal measurements in Serbia and Slovenia
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2438
ER  - 

@conference{
author = "Ajtić, Jelena and Sarvan, Darko and Todorović, Dragana and Rajačić, Milica and Krneta Nikolić, Jelena and Djurdjević, Vladimir and Zorko, Benjamin and Vodenik, Branko and Cindro Glavič, Denis and Jasmina, Kožar Logar",
year = "2017",
abstract = "Beryllium-7 is a natural radionuclide produced in spallation processes in the upper troposphere
and lower stratosphere. Descent through the atmosphere brings this isotope to the lower altitudes and
its abundance at the surface is a result of an interplay between transport and removal processes, both
of which are influenced by local meteorological parameters.
In this analysis we use the beryllium-7 specific activities measured in three locations to investigate
spatial similarities and differences in the data sets. The measurement sites are: Belgrade, the capital of
Serbia; Ljubljana, the capital of Slovenia, located around 500 km west of Belgrade; and Krško, a town
in eastern Slovenia, located around 400 km west of Belgrade. The beryllium-7 measurements in Serbia
and Slovenia started in 1991 and 1988, respectively. The specific activities were determined by standard
gamma spectrometry at the Vinča Institute (Serbia) and Jožef Stefan Institute (Slovenia).",
publisher = "RAD Association",
journal = "Fifth International Conference on Radiation and Applications in Various Fields of Research, RAD 2017, 12.06 - 16.06. Budva, Montenegro",
title = "Beryllium-7 in surface air–Multidecadal measurements in Serbia and Slovenia",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2438"
}

Ajtić, J., Sarvan, D., Todorović, D., Rajačić, M., Krneta Nikolić, J., Djurdjević, V., Zorko, B., Vodenik, B., Cindro Glavič, D.,& Jasmina, K. L.. (2017). Beryllium-7 in surface air–Multidecadal measurements in Serbia and Slovenia. in Fifth International Conference on Radiation and Applications in Various Fields of Research, RAD 2017, 12.06 - 16.06. Budva, Montenegro
RAD Association..
https://hdl.handle.net/21.15107/rcub_veterinar_2438

Ajtić J, Sarvan D, Todorović D, Rajačić M, Krneta Nikolić J, Djurdjević V, Zorko B, Vodenik B, Cindro Glavič D, Jasmina KL. Beryllium-7 in surface air–Multidecadal measurements in Serbia and Slovenia. in Fifth International Conference on Radiation and Applications in Various Fields of Research, RAD 2017, 12.06 - 16.06. Budva, Montenegro. 2017;.
https://hdl.handle.net/21.15107/rcub_veterinar_2438 .

Ajtić, Jelena, Sarvan, Darko, Todorović, Dragana, Rajačić, Milica, Krneta Nikolić, Jelena, Djurdjević, Vladimir, Zorko, Benjamin, Vodenik, Branko, Cindro Glavič, Denis, Jasmina, Kožar Logar, "Beryllium-7 in surface air–Multidecadal measurements in Serbia and Slovenia" in Fifth International Conference on Radiation and Applications in Various Fields of Research, RAD 2017, 12.06 - 16.06. Budva, Montenegro (2017),
https://hdl.handle.net/21.15107/rcub_veterinar_2438 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Todorović, Dragana
AU  - Rajačić, Milica
AU  - Krneta-Nikolić, Jelena D.
AU  - Đurđević, Vladimir
AU  - Zorko, Benjamin
AU  - Vodenik, Branko
AU  - Glavič-Cindro, Denis
AU  - Kožar Logar, Jasmina
PY  - 2017
AB  - Međusobna povezanost specifičnih aktivnosti berilijuma-7 i olova-210 u prizemnomsloju atmosfere sa meteorološkim parametrima razmotrena je u faktorskoj analizi.Merenja su sprovedena u Beogradu, Republika Srbija, i u Ljubljani i Krškom, uRepublici Sloveniji, tokom 1991–2015 godine. Na sve tri lokacije, faktorska opterećenjadva faktora pokazuju da je: 1) specifična aktivnost berilijuma-7 obuhvaćena faktorom 1sa temperaturom, oblačnošću i relativnom vlažnošću; dok je 2) specifična aktivnostolova-210 obuhvaćena faktorom 2 sa količinom padavina i atmosferskim pritiskom.Iako je komunalitet već dva faktora veći od 0,5 za većinu posmatranih varijabli, tekuvođenjem trećeg faktora komunalitet za specifičnu aktivnost olova-210 i atmosferskogpritiska na sve tri merne lokacije raste na preko 0,5. Rezultati faktorske analizepokazuju da se specifične aktivnosti berilijuma-7 i olova-210 u prizmenom slojuatmosfere nalaze pod različitim dominantnim uticajima. Koncentracija berilijuma-7 jepod uticajem faktora regionalnog karaktera, koji je takođe dominantan za srednjutemperaturu. Ova veza specifične aktivnosti berilijuma-7 i temperature preko dominantnog zajedničkog faktora važi i kada se broj faktora u analizi poveća na tri i četiri.Sa druge strane, na koncentraciju olova-210, kao i na količinu padavina i atmosferskipritisak, više uticaja ima lokalni faktor. Ova povezanost olova-210 sa druga dvameteorološka parametra, međutim, prestaje da važi sa povećanjem broja faktora uanalizi na tri, kada se izdvaja specifičan faktor koji objašnjava preko 80% varijansespecifične aktivnosti olova-210.
AB  - An association between the beryllium-7 and lead-210 specific activities in surface airand meteorological parameters is investigated using factor analysis. The measurementswere conducted in Belgrade, Republic of Serbia, and Ljubljana and Krško, Republic ofSlovenia, over 1991–2015. In all the locations, the factor loadings of two factors showthat: 1) the beryllium-7 specific activity is encompassed by factor 1 together withtemperature, cloud cover and relative humidity; while 2) the lead-210 specific activity,precipitation and atmospheric pressure are described by factor 2. Although thecommunalities of only two factors are already larger than 0.5 for most of the variables,an introduction of a third factor raises the communalities of all the variables above 0.5.The results imply that the beryllium-7 and lead-210 are under different dominantunderlying mechanisms. The concentration of beryllium-7 seems to be primarilyinfluenced by a mechanism of a regional character which is also a predominant factorfor temperature. This association between the beryllium-7 specific activity andtemperature prevails even when the number of factors in the analysis is raised to threeand four. The lead-210 specific activity, on the other hand, together with precipitationand atmospheric pressure, is under an influence of a local mechanism, but thatrelationship between the variables ceases to hold when the number of factors is raisedto three, and more than 80% of the variance in the Pb-210 specific activity is explainedby one specific factor.
PB  - Beograd : Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, str. Srebrno jezero, Srbija
T1  - Faktorska analiza specifičnih aktivnosti berilijuma-7 i olova-210 u prizemnom sloju vazduha, i meteoroloških parametara
T1  - Factor analysis of the beryllium-7 and lead-210 specific activities in surface air, and meteorological parameters
SP  - 19
EP  - 27
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2375
ER  - 

@conference{
author = "Ajtić, Jelena and Sarvan, Darko and Todorović, Dragana and Rajačić, Milica and Krneta-Nikolić, Jelena D. and Đurđević, Vladimir and Zorko, Benjamin and Vodenik, Branko and Glavič-Cindro, Denis and Kožar Logar, Jasmina",
year = "2017",
abstract = "Međusobna povezanost specifičnih aktivnosti berilijuma-7 i olova-210 u prizemnomsloju atmosfere sa meteorološkim parametrima razmotrena je u faktorskoj analizi.Merenja su sprovedena u Beogradu, Republika Srbija, i u Ljubljani i Krškom, uRepublici Sloveniji, tokom 1991–2015 godine. Na sve tri lokacije, faktorska opterećenjadva faktora pokazuju da je: 1) specifična aktivnost berilijuma-7 obuhvaćena faktorom 1sa temperaturom, oblačnošću i relativnom vlažnošću; dok je 2) specifična aktivnostolova-210 obuhvaćena faktorom 2 sa količinom padavina i atmosferskim pritiskom.Iako je komunalitet već dva faktora veći od 0,5 za većinu posmatranih varijabli, tekuvođenjem trećeg faktora komunalitet za specifičnu aktivnost olova-210 i atmosferskogpritiska na sve tri merne lokacije raste na preko 0,5. Rezultati faktorske analizepokazuju da se specifične aktivnosti berilijuma-7 i olova-210 u prizmenom slojuatmosfere nalaze pod različitim dominantnim uticajima. Koncentracija berilijuma-7 jepod uticajem faktora regionalnog karaktera, koji je takođe dominantan za srednjutemperaturu. Ova veza specifične aktivnosti berilijuma-7 i temperature preko dominantnog zajedničkog faktora važi i kada se broj faktora u analizi poveća na tri i četiri.Sa druge strane, na koncentraciju olova-210, kao i na količinu padavina i atmosferskipritisak, više uticaja ima lokalni faktor. Ova povezanost olova-210 sa druga dvameteorološka parametra, međutim, prestaje da važi sa povećanjem broja faktora uanalizi na tri, kada se izdvaja specifičan faktor koji objašnjava preko 80% varijansespecifične aktivnosti olova-210., An association between the beryllium-7 and lead-210 specific activities in surface airand meteorological parameters is investigated using factor analysis. The measurementswere conducted in Belgrade, Republic of Serbia, and Ljubljana and Krško, Republic ofSlovenia, over 1991–2015. In all the locations, the factor loadings of two factors showthat: 1) the beryllium-7 specific activity is encompassed by factor 1 together withtemperature, cloud cover and relative humidity; while 2) the lead-210 specific activity,precipitation and atmospheric pressure are described by factor 2. Although thecommunalities of only two factors are already larger than 0.5 for most of the variables,an introduction of a third factor raises the communalities of all the variables above 0.5.The results imply that the beryllium-7 and lead-210 are under different dominantunderlying mechanisms. The concentration of beryllium-7 seems to be primarilyinfluenced by a mechanism of a regional character which is also a predominant factorfor temperature. This association between the beryllium-7 specific activity andtemperature prevails even when the number of factors in the analysis is raised to threeand four. The lead-210 specific activity, on the other hand, together with precipitationand atmospheric pressure, is under an influence of a local mechanism, but thatrelationship between the variables ceases to hold when the number of factors is raisedto three, and more than 80% of the variance in the Pb-210 specific activity is explainedby one specific factor.",
publisher = "Beograd : Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, str. Srebrno jezero, Srbija",
title = "Faktorska analiza specifičnih aktivnosti berilijuma-7 i olova-210 u prizemnom sloju vazduha, i meteoroloških parametara, Factor analysis of the beryllium-7 and lead-210 specific activities in surface air, and meteorological parameters",
pages = "19-27",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2375"
}

Ajtić, J., Sarvan, D., Todorović, D., Rajačić, M., Krneta-Nikolić, J. D., Đurđević, V., Zorko, B., Vodenik, B., Glavič-Cindro, D.,& Kožar Logar, J.. (2017). Faktorska analiza specifičnih aktivnosti berilijuma-7 i olova-210 u prizemnom sloju vazduha, i meteoroloških parametara. in Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, str. Srebrno jezero, Srbija
Beograd : Institut za nuklearne nauke "Vinča"., 19-27.
https://hdl.handle.net/21.15107/rcub_veterinar_2375

Ajtić J, Sarvan D, Todorović D, Rajačić M, Krneta-Nikolić JD, Đurđević V, Zorko B, Vodenik B, Glavič-Cindro D, Kožar Logar J. Faktorska analiza specifičnih aktivnosti berilijuma-7 i olova-210 u prizemnom sloju vazduha, i meteoroloških parametara. in Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, str. Srebrno jezero, Srbija. 2017;:19-27.
https://hdl.handle.net/21.15107/rcub_veterinar_2375 .

Ajtić, Jelena, Sarvan, Darko, Todorović, Dragana, Rajačić, Milica, Krneta-Nikolić, Jelena D., Đurđević, Vladimir, Zorko, Benjamin, Vodenik, Branko, Glavič-Cindro, Denis, Kožar Logar, Jasmina, "Faktorska analiza specifičnih aktivnosti berilijuma-7 i olova-210 u prizemnom sloju vazduha, i meteoroloških parametara" in Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, str. Srebrno jezero, Srbija (2017):19-27,
https://hdl.handle.net/21.15107/rcub_veterinar_2375 .

TY  - CONF
AU  - Vukašinović, Ivana
AU  - Todorović, Dragana
AU  - Nikolić, Jelena D.
AU  - Rajačić, Milica
AU  - Ajtić, Jelena
PY  - 2017
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2376
AB  - Specifična aktivnost prirodnih radionuklida 238U, 235U, 226Ra, 210Pb, 232Th i 40K iproizvedenog 137Cs je merena u uzorcima lišća dve vrste listopadnog drveća, kestena(Aesculus hippocastanum) i lipe (Tilia spp) koji potiču iz tri gradska parka na užempodručju Beograda. Uzorci su sakupljani u vreme prolećne (n=7), letnje (n=2) i jesenje(n=8) sezone u periodu od 2002-2012. godine. Iz svake pojedinačne sezone uzorci lišćasu spojeni po vrstama pri čemu je dobijen jedan integralni (sezonski) uzorak za svakiispitivani park čime je postignuta veća efikasnost detekcije niskog nivoa gama zračenja.Za određivanje aktivnosti primenjen je metod spektrometrije gama emitera. U svimpojedinačnim uzorcima suve materije lišća detekcija radionuklida 210Pb i 40K je bilamoguća i njihova specifična aktivnost se nalazila intervalu 15-52 Bq/kg i 310-650Bq/kg, respektivno. Iako je aktivnost 226Ra bila veoma niska, u intervalu 0,5-5,6 Bq/kg,ovaj radionuklid je bio izmeren u svim uzorcima (osim u dva) i svim sezonama.Aktivnost 210Pb i 226Ra se povećavala tokom godine, pri čemu su njihove najvećevrednosti izmerene u lišću kestena u letnjoj sezoni. Suprotno, aktivnost 40K u lišću lipe ikestena je opadala tokom godine. Za razliku od prethodno navedenih, radionuklidi 238U,235U i 232Th su retko detektovani samo u letnjem i/ili jesenjem periodu i po četiri uzorkališća su sadržali 238U (2,7-11,7 Bq/kg) i 235U (0,13-1,0 Bq/kg), a tri 232Th (1,8-3,3Bq/kg). Proizvedeni radionuklid 137Cs detektovan je u svim uzorcima lišća (osim u dva),a bez jasnog trenda ponašanja po sezonama i nalazio se u intervalu 0,3-1,2 Bq/kg. Ciljrada bio je ispitivanje akumulacije prirodnih radionuklida i njihovog potencijalnogvariranja tokom godine u lišću listopadnog drveća.
AB  - The specific activity of naturally occurring radionuclides 238U, 235U, 226Ra, 210Pb, 232Th,and 40K and fallout 137Cs was measured in the samples of leaves of two deciduous treespecies, chestnut (Aesculus hippocastanum) and linden (Tilia spp.) common for theBelgrade urban area. Samples were collected in the spring (n = 7), summer (n = 2) andautumn (n = 8) during the vegetation period from 2002 to 2012. From each season,samples of leaves were combined according to two species and one single integral(seasonal) sample was obtained in order to improve detection efficiency of low gammaradiation level. Specific activities were determined using the gamma-ray spectrometrymethod. 210Pb and 40K radionuclides were detected in all the samples of leaves and theirspecific activity was in the range (Bq/kg dry weight): 15 - 52 and 310 - 650,respectively. Although the 226Ra level was very low and in the range from 0.5 - 5.6Bq/kg, this radionuclide has been measured in all samples (except in the two) and eachseason.210Pb and 226Ra activity increased during the vegetation period and theirhighest values were found in the leaves of chestnut trees in the summer season. Incontrast, the activity of 40K in the leaves of linden and chestnut has decreased.Detection 238U, 235U and 232Th radionuclides was scarce and only in the summer and/orautumn. Four samples of leaves contained 238U (2.7 - 11.7 Bq/kg dry wt) and 235U (0,13- 1.0 Bq/kg dry wt) and three of them 232Th (1.8 - 3.3 Bq/kg dry wt). Man-maderadionuclide 137Cs (0.3-1.2 Bq/kg dry wt) was detected in all samples of leaves (exceptin two) and no clear trend according to seasons was found. The aim was to investigatethe accumulation of naturally occurring radionuclides and fallout 137Cs in the leaves ofdeciduous trees and their potential variations during the vegetation period.
PB  - Beograd : Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, Srebrno jezero, Srbija
T1  - Sezonske promene aktivnosti prirodnih radionuklida i proizvedenog 137-Cs u uzorcima lišća listopadnog drveća
T1  - Seasonal changes of naturally occurring radionuclides and fallout 137-Cs in the samples of leaves of deciduous trees
SP  - 117
EP  - 123
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2376
ER  - 

@conference{
author = "Vukašinović, Ivana and Todorović, Dragana and Nikolić, Jelena D. and Rajačić, Milica and Ajtić, Jelena",
year = "2017",
abstract = "Specifična aktivnost prirodnih radionuklida 238U, 235U, 226Ra, 210Pb, 232Th i 40K iproizvedenog 137Cs je merena u uzorcima lišća dve vrste listopadnog drveća, kestena(Aesculus hippocastanum) i lipe (Tilia spp) koji potiču iz tri gradska parka na užempodručju Beograda. Uzorci su sakupljani u vreme prolećne (n=7), letnje (n=2) i jesenje(n=8) sezone u periodu od 2002-2012. godine. Iz svake pojedinačne sezone uzorci lišćasu spojeni po vrstama pri čemu je dobijen jedan integralni (sezonski) uzorak za svakiispitivani park čime je postignuta veća efikasnost detekcije niskog nivoa gama zračenja.Za određivanje aktivnosti primenjen je metod spektrometrije gama emitera. U svimpojedinačnim uzorcima suve materije lišća detekcija radionuklida 210Pb i 40K je bilamoguća i njihova specifična aktivnost se nalazila intervalu 15-52 Bq/kg i 310-650Bq/kg, respektivno. Iako je aktivnost 226Ra bila veoma niska, u intervalu 0,5-5,6 Bq/kg,ovaj radionuklid je bio izmeren u svim uzorcima (osim u dva) i svim sezonama.Aktivnost 210Pb i 226Ra se povećavala tokom godine, pri čemu su njihove najvećevrednosti izmerene u lišću kestena u letnjoj sezoni. Suprotno, aktivnost 40K u lišću lipe ikestena je opadala tokom godine. Za razliku od prethodno navedenih, radionuklidi 238U,235U i 232Th su retko detektovani samo u letnjem i/ili jesenjem periodu i po četiri uzorkališća su sadržali 238U (2,7-11,7 Bq/kg) i 235U (0,13-1,0 Bq/kg), a tri 232Th (1,8-3,3Bq/kg). Proizvedeni radionuklid 137Cs detektovan je u svim uzorcima lišća (osim u dva),a bez jasnog trenda ponašanja po sezonama i nalazio se u intervalu 0,3-1,2 Bq/kg. Ciljrada bio je ispitivanje akumulacije prirodnih radionuklida i njihovog potencijalnogvariranja tokom godine u lišću listopadnog drveća., The specific activity of naturally occurring radionuclides 238U, 235U, 226Ra, 210Pb, 232Th,and 40K and fallout 137Cs was measured in the samples of leaves of two deciduous treespecies, chestnut (Aesculus hippocastanum) and linden (Tilia spp.) common for theBelgrade urban area. Samples were collected in the spring (n = 7), summer (n = 2) andautumn (n = 8) during the vegetation period from 2002 to 2012. From each season,samples of leaves were combined according to two species and one single integral(seasonal) sample was obtained in order to improve detection efficiency of low gammaradiation level. Specific activities were determined using the gamma-ray spectrometrymethod. 210Pb and 40K radionuclides were detected in all the samples of leaves and theirspecific activity was in the range (Bq/kg dry weight): 15 - 52 and 310 - 650,respectively. Although the 226Ra level was very low and in the range from 0.5 - 5.6Bq/kg, this radionuclide has been measured in all samples (except in the two) and eachseason.210Pb and 226Ra activity increased during the vegetation period and theirhighest values were found in the leaves of chestnut trees in the summer season. Incontrast, the activity of 40K in the leaves of linden and chestnut has decreased.Detection 238U, 235U and 232Th radionuclides was scarce and only in the summer and/orautumn. Four samples of leaves contained 238U (2.7 - 11.7 Bq/kg dry wt) and 235U (0,13- 1.0 Bq/kg dry wt) and three of them 232Th (1.8 - 3.3 Bq/kg dry wt). Man-maderadionuclide 137Cs (0.3-1.2 Bq/kg dry wt) was detected in all samples of leaves (exceptin two) and no clear trend according to seasons was found. The aim was to investigatethe accumulation of naturally occurring radionuclides and fallout 137Cs in the leaves ofdeciduous trees and their potential variations during the vegetation period.",
publisher = "Beograd : Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, Srebrno jezero, Srbija",
title = "Sezonske promene aktivnosti prirodnih radionuklida i proizvedenog 137-Cs u uzorcima lišća listopadnog drveća, Seasonal changes of naturally occurring radionuclides and fallout 137-Cs in the samples of leaves of deciduous trees",
pages = "117-123",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2376"
}

Vukašinović, I., Todorović, D., Nikolić, J. D., Rajačić, M.,& Ajtić, J.. (2017). Sezonske promene aktivnosti prirodnih radionuklida i proizvedenog 137-Cs u uzorcima lišća listopadnog drveća. in Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, Srebrno jezero, Srbija
Beograd : Institut za nuklearne nauke "Vinča"., 117-123.
https://hdl.handle.net/21.15107/rcub_veterinar_2376

Vukašinović I, Todorović D, Nikolić JD, Rajačić M, Ajtić J. Sezonske promene aktivnosti prirodnih radionuklida i proizvedenog 137-Cs u uzorcima lišća listopadnog drveća. in Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, Srebrno jezero, Srbija. 2017;:117-123.
https://hdl.handle.net/21.15107/rcub_veterinar_2376 .

Vukašinović, Ivana, Todorović, Dragana, Nikolić, Jelena D., Rajačić, Milica, Ajtić, Jelena, "Sezonske promene aktivnosti prirodnih radionuklida i proizvedenog 137-Cs u uzorcima lišća listopadnog drveća" in Zbornik radova sa XXIX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 27–29. septembar, 2017, Srebrno jezero, Srbija (2017):117-123,
https://hdl.handle.net/21.15107/rcub_veterinar_2376 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Maletić, Dimitrije
AU  - Stratimirović, Đorđe
AU  - Blesić, Suzana
AU  - Nikolić, Jelena
AU  - Đurđević, Vladimir S.
AU  - Todorović, Dragana
PY  - 2015
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1286
AB  - Dependence of the lead-210 activity concentration in surface air on meteorological variables and teleconnection indices is investigated using multivariate analysis, which gives the Boosted Decision Trees method as the most suitable for variable analysis. A mapped functional behaviour of the lead-210 activity concentration is further obtained, and used to test predictability of lead-210 in surface air. The results show an agreement between the predicted and measured values. The temporal evolution of the measured activities is satisfactorily matched by the prediction. The largest qualitative differences are obtained for winter months.
PB  - RAD Association
C3  - Rad 2015: The Third International Conference on Radiation and Applications in Various Fields of Rese
T1  - Predictability of lead-210 in surface air based on multivariate analysis
SP  - 317
EP  - 322
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_1286
ER  - 

@conference{
author = "Ajtić, Jelena and Maletić, Dimitrije and Stratimirović, Đorđe and Blesić, Suzana and Nikolić, Jelena and Đurđević, Vladimir S. and Todorović, Dragana",
year = "2015",
abstract = "Dependence of the lead-210 activity concentration in surface air on meteorological variables and teleconnection indices is investigated using multivariate analysis, which gives the Boosted Decision Trees method as the most suitable for variable analysis. A mapped functional behaviour of the lead-210 activity concentration is further obtained, and used to test predictability of lead-210 in surface air. The results show an agreement between the predicted and measured values. The temporal evolution of the measured activities is satisfactorily matched by the prediction. The largest qualitative differences are obtained for winter months.",
publisher = "RAD Association",
journal = "Rad 2015: The Third International Conference on Radiation and Applications in Various Fields of Rese",
title = "Predictability of lead-210 in surface air based on multivariate analysis",
pages = "317-322",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_1286"
}

Ajtić, J., Maletić, D., Stratimirović, Đ., Blesić, S., Nikolić, J., Đurđević, V. S.,& Todorović, D.. (2015). Predictability of lead-210 in surface air based on multivariate analysis. in Rad 2015: The Third International Conference on Radiation and Applications in Various Fields of Rese
RAD Association., 317-322.
https://hdl.handle.net/21.15107/rcub_veterinar_1286

Ajtić J, Maletić D, Stratimirović Đ, Blesić S, Nikolić J, Đurđević VS, Todorović D. Predictability of lead-210 in surface air based on multivariate analysis. in Rad 2015: The Third International Conference on Radiation and Applications in Various Fields of Rese. 2015;:317-322.
https://hdl.handle.net/21.15107/rcub_veterinar_1286 .

Ajtić, Jelena, Maletić, Dimitrije, Stratimirović, Đorđe, Blesić, Suzana, Nikolić, Jelena, Đurđević, Vladimir S., Todorović, Dragana, "Predictability of lead-210 in surface air based on multivariate analysis" in Rad 2015: The Third International Conference on Radiation and Applications in Various Fields of Rese (2015):317-322,
https://hdl.handle.net/21.15107/rcub_veterinar_1286 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Todorović, Dragana
AU  - Nikolić, Jelena
PY  - 2015
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2378
AB  - Linearna korelacija izmeĎu specifične aktivnosti berilijuma-7 u prizemnom sloju
atmosfere i visine tropopauze, analizirana je na 21 lokaciji u Evropi. Geografska širina
odabranih lokacija je u rasponu 37–69 °N. Lokacije su grupisane u pet pojaseva
geografske širine. Za svaku lokaciju, koeficijenti linearne korelacije računati su sa
„vremenskom razdvojenošću“ – izmerena specifična aktivnost berilijuma-7 korelisana
je sa srednjom vrednošću visine tropopauze tokom odreĎenog broja dana koji je
prethodio merenju. Ovaj broj dana varirao je od 0 do 31. Za dobijene nizove linearnih
korelacionih koeficijenata pronaĎeni su maksumumi kao i broj dana vremenske
razdvojenosti na kojima su maksimumi dostignuti. PoreĎenja radi, dati su i rezultati za
mernu stanicu Vinča, Beograd, za koju su koeficijenti linearne korelacije izračunati na
osnovu srednjih mesečnih specifičnih aktivnosti berilijuma-7 i srednjih mesečnih visina
tropopauze. Srednja vrednost maksimalnog koeficijenta linearne korelacije za sve
stanice: iznosi 0,350 i u proseku se dostiţe posle 10 dana; raste od severa ka jugu.
Merne stanice duţ obale Atlanskog okeana ili u njegovoj blizini imaju najniţe vrednosti
maksimalnog koeficijenta korelacije. Srednja sezonska vrednost maksimalnog
koeficijenta korelacije raste od 0,249 tokom zime do 0,470 tokom jeseni, i praćena je
rastom srednjeg sezonskog broj dana vremenske razdvojenosti – tokom zime iznosi
sedam dana, a tokom jeseni 16 dana. U sezonskim korelacijama razlikuju se dva pojasa
geografske širine, severno i juţno od 55 °N, u kojima linearnа povezanost specifične
aktivnosti berilijuma-7 i visine tropopauze ima drugačiji karakter.
AB  - Linear correlation between the 7Be specific activity in surface air and tropopause height
is analysed for 21 locations in Europe. The latitude of the locations spans from 37 °N to
69 °N. The locations are grouped into five latitudinal belts. For each location, the linear
correlation coefficients are calculated with a time lag – the measured 7Be specific
activity is correlated with the mean tropopause height over a number of days that
preceded the day of the measurements. Time lag varied from 0 to 31. The maxima are
found in the calculated arrays of the linear correlation coefficients, as well as the
number of days for which the maxima are reached. For comparison, the results for a
measurement location Vinĉa in Belgrade, Serbia, are also given. For this site, the linear
correlation coefficients are calculated using the monthly means of the 7Be specific
activity and tropopause height. The mean value of the maximum linear correlation
coefficient for the whole set of measurements is 0.350, and is on average reached after
the time lag of ten days. In the investigated latitudinal belts, this mean value increases
as the latitude decreases. The measurement locations along the coast of the Atlantic or
in its proximity show the least linear correlation. The mean seasonal maximum
correlation coefficient increases from 0.249 during winter to 0.470 during autumn, and
is matched by an increase in the mean time lag which ranges from 7 days in winter to 16
days in autumn. The seasonal correlations show two latitudinal belts, north of 55 °N and
south of 55 °N, in which the linear correlation of the 7Be specific activity and
tropopause height exhibits somewhat different characteristics.
PB  - Beograd : Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - Zbornik radova sa XXVIII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 30. septembar – 2. oktobar, 2015, Vršac, Srbija
T1  - Berilijum-7 i visina tropopauze: Analiza korelacija po pojasevima geografske širine
T1  - Beryllium-7 and tropopause height: an analysis of correlations across latitudinal belts
SP  - 35
EP  - 42
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2378
ER  - 

@conference{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Sarvan, Darko and Todorović, Dragana and Nikolić, Jelena",
year = "2015",
abstract = "Linearna korelacija izmeĎu specifične aktivnosti berilijuma-7 u prizemnom sloju
atmosfere i visine tropopauze, analizirana je na 21 lokaciji u Evropi. Geografska širina
odabranih lokacija je u rasponu 37–69 °N. Lokacije su grupisane u pet pojaseva
geografske širine. Za svaku lokaciju, koeficijenti linearne korelacije računati su sa
„vremenskom razdvojenošću“ – izmerena specifična aktivnost berilijuma-7 korelisana
je sa srednjom vrednošću visine tropopauze tokom odreĎenog broja dana koji je
prethodio merenju. Ovaj broj dana varirao je od 0 do 31. Za dobijene nizove linearnih
korelacionih koeficijenata pronaĎeni su maksumumi kao i broj dana vremenske
razdvojenosti na kojima su maksimumi dostignuti. PoreĎenja radi, dati su i rezultati za
mernu stanicu Vinča, Beograd, za koju su koeficijenti linearne korelacije izračunati na
osnovu srednjih mesečnih specifičnih aktivnosti berilijuma-7 i srednjih mesečnih visina
tropopauze. Srednja vrednost maksimalnog koeficijenta linearne korelacije za sve
stanice: iznosi 0,350 i u proseku se dostiţe posle 10 dana; raste od severa ka jugu.
Merne stanice duţ obale Atlanskog okeana ili u njegovoj blizini imaju najniţe vrednosti
maksimalnog koeficijenta korelacije. Srednja sezonska vrednost maksimalnog
koeficijenta korelacije raste od 0,249 tokom zime do 0,470 tokom jeseni, i praćena je
rastom srednjeg sezonskog broj dana vremenske razdvojenosti – tokom zime iznosi
sedam dana, a tokom jeseni 16 dana. U sezonskim korelacijama razlikuju se dva pojasa
geografske širine, severno i juţno od 55 °N, u kojima linearnа povezanost specifične
aktivnosti berilijuma-7 i visine tropopauze ima drugačiji karakter., Linear correlation between the 7Be specific activity in surface air and tropopause height
is analysed for 21 locations in Europe. The latitude of the locations spans from 37 °N to
69 °N. The locations are grouped into five latitudinal belts. For each location, the linear
correlation coefficients are calculated with a time lag – the measured 7Be specific
activity is correlated with the mean tropopause height over a number of days that
preceded the day of the measurements. Time lag varied from 0 to 31. The maxima are
found in the calculated arrays of the linear correlation coefficients, as well as the
number of days for which the maxima are reached. For comparison, the results for a
measurement location Vinĉa in Belgrade, Serbia, are also given. For this site, the linear
correlation coefficients are calculated using the monthly means of the 7Be specific
activity and tropopause height. The mean value of the maximum linear correlation
coefficient for the whole set of measurements is 0.350, and is on average reached after
the time lag of ten days. In the investigated latitudinal belts, this mean value increases
as the latitude decreases. The measurement locations along the coast of the Atlantic or
in its proximity show the least linear correlation. The mean seasonal maximum
correlation coefficient increases from 0.249 during winter to 0.470 during autumn, and
is matched by an increase in the mean time lag which ranges from 7 days in winter to 16
days in autumn. The seasonal correlations show two latitudinal belts, north of 55 °N and
south of 55 °N, in which the linear correlation of the 7Be specific activity and
tropopause height exhibits somewhat different characteristics.",
publisher = "Beograd : Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "Zbornik radova sa XXVIII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 30. septembar – 2. oktobar, 2015, Vršac, Srbija",
title = "Berilijum-7 i visina tropopauze: Analiza korelacija po pojasevima geografske širine, Beryllium-7 and tropopause height: an analysis of correlations across latitudinal belts",
pages = "35-42",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2378"
}

Ajtić, J., Djurdjević, V., Sarvan, D., Todorović, D.,& Nikolić, J.. (2015). Berilijum-7 i visina tropopauze: Analiza korelacija po pojasevima geografske širine. in Zbornik radova sa XXVIII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 30. septembar – 2. oktobar, 2015, Vršac, Srbija
Beograd : Institut za nuklearne nauke "Vinča"., 35-42.
https://hdl.handle.net/21.15107/rcub_veterinar_2378

Ajtić J, Djurdjević V, Sarvan D, Todorović D, Nikolić J. Berilijum-7 i visina tropopauze: Analiza korelacija po pojasevima geografske širine. in Zbornik radova sa XXVIII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 30. septembar – 2. oktobar, 2015, Vršac, Srbija. 2015;:35-42.
https://hdl.handle.net/21.15107/rcub_veterinar_2378 .

Ajtić, Jelena, Djurdjević, Vladimir, Sarvan, Darko, Todorović, Dragana, Nikolić, Jelena, "Berilijum-7 i visina tropopauze: Analiza korelacija po pojasevima geografske širine" in Zbornik radova sa XXVIII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 30. septembar – 2. oktobar, 2015, Vršac, Srbija (2015):35-42,
https://hdl.handle.net/21.15107/rcub_veterinar_2378 .

TY  - CONF
AU  - Maletić, Dimitrije
AU  - Ajtić, Jelena
AU  - Đurđević, V.
AU  - Todorović, Dragana
AU  - Nikolić, J.
AU  - Banjanac, R.
AU  - Udovičić, V.
PY  - 2014
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1149
AB  - Activities of lead-210 and beryllium-7 have been monitored at the Vinča Institute of Nuclear Sciences in Belgrade, Serbia. The monthly mean activities in composite aerosol samples were determined on HPGe detectors by standard gamma spectrometry. The meteorological data, consisting of the temperature, atmospheric pressure, relative humidity, sunshine hours and cloud cover data were obtained from the European Climate Assessment & Dataset and the Republic Hydrometeorological Service of Serbia. Five teleconnection indices of large scale atmospheric circulation: North Atlantic Oscillation, East Atlantic Pattern, East Atlantic/West Russia Pattern, Scandinavia Pattern, and Polar/Eurasia Pattern were obtained from the data archive of the United States National Oceanic and Atmospheric Administration's Climate Prediction Center. The first lead-210 and beryllium-7 activities measured at the Vinča Institute date back to 1985 and 1991, respectively, and their relation with the climate variables and teleconnection indices is investigated using multivariate methods of analysis. The most appropriate multivariate method of analysis of these sets of measurements is selected from a wide spectrum of multivariate methods developed for data analysis in high-energy physics and implemented in the Toolkit for Multivariate Analysis software package. The evaluation ranking results based on the best signal efficiency and purity, show that the Boosted Decision Trees (BDT) multivariate method is the most suitable for the variable analysis. Further multivariate analysis results give insight into the dependence of lead-210 and beryllium-7 concentrations upon the climate variables and atmospheric circulation (via the teleconnection indices) during the time of measurements. The BDT method singles out the Scandinavia Pattern index as the variable with the highest importance for both radionuclides. Amongst the climate variables, temperature shows the strongest influence on the radionuclide concentrations, while relative humidity is the lowest ranking variable. Moreover, the multivariate regression methods give a good approximation of lead-210 and beryllium-7 concentrations for all the sets of climate variables and teleconnection indices.
PB  - RAD Association
C3  - RAD Conference Proceedings
T1  - Multivariate analysis of climate variables, teleconnection indices and activities of lead-210 and beryllium-7 in surface air in Belgrade, Serbia
SP  - 13
EP  - 16
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_1149
ER  - 

@conference{
author = "Maletić, Dimitrije and Ajtić, Jelena and Đurđević, V. and Todorović, Dragana and Nikolić, J. and Banjanac, R. and Udovičić, V.",
year = "2014",
abstract = "Activities of lead-210 and beryllium-7 have been monitored at the Vinča Institute of Nuclear Sciences in Belgrade, Serbia. The monthly mean activities in composite aerosol samples were determined on HPGe detectors by standard gamma spectrometry. The meteorological data, consisting of the temperature, atmospheric pressure, relative humidity, sunshine hours and cloud cover data were obtained from the European Climate Assessment & Dataset and the Republic Hydrometeorological Service of Serbia. Five teleconnection indices of large scale atmospheric circulation: North Atlantic Oscillation, East Atlantic Pattern, East Atlantic/West Russia Pattern, Scandinavia Pattern, and Polar/Eurasia Pattern were obtained from the data archive of the United States National Oceanic and Atmospheric Administration's Climate Prediction Center. The first lead-210 and beryllium-7 activities measured at the Vinča Institute date back to 1985 and 1991, respectively, and their relation with the climate variables and teleconnection indices is investigated using multivariate methods of analysis. The most appropriate multivariate method of analysis of these sets of measurements is selected from a wide spectrum of multivariate methods developed for data analysis in high-energy physics and implemented in the Toolkit for Multivariate Analysis software package. The evaluation ranking results based on the best signal efficiency and purity, show that the Boosted Decision Trees (BDT) multivariate method is the most suitable for the variable analysis. Further multivariate analysis results give insight into the dependence of lead-210 and beryllium-7 concentrations upon the climate variables and atmospheric circulation (via the teleconnection indices) during the time of measurements. The BDT method singles out the Scandinavia Pattern index as the variable with the highest importance for both radionuclides. Amongst the climate variables, temperature shows the strongest influence on the radionuclide concentrations, while relative humidity is the lowest ranking variable. Moreover, the multivariate regression methods give a good approximation of lead-210 and beryllium-7 concentrations for all the sets of climate variables and teleconnection indices.",
publisher = "RAD Association",
journal = "RAD Conference Proceedings",
title = "Multivariate analysis of climate variables, teleconnection indices and activities of lead-210 and beryllium-7 in surface air in Belgrade, Serbia",
pages = "13-16",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_1149"
}

Maletić, D., Ajtić, J., Đurđević, V., Todorović, D., Nikolić, J., Banjanac, R.,& Udovičić, V.. (2014). Multivariate analysis of climate variables, teleconnection indices and activities of lead-210 and beryllium-7 in surface air in Belgrade, Serbia. in RAD Conference Proceedings
RAD Association., 13-16.
https://hdl.handle.net/21.15107/rcub_veterinar_1149

Maletić D, Ajtić J, Đurđević V, Todorović D, Nikolić J, Banjanac R, Udovičić V. Multivariate analysis of climate variables, teleconnection indices and activities of lead-210 and beryllium-7 in surface air in Belgrade, Serbia. in RAD Conference Proceedings. 2014;:13-16.
https://hdl.handle.net/21.15107/rcub_veterinar_1149 .

Maletić, Dimitrije, Ajtić, Jelena, Đurđević, V., Todorović, Dragana, Nikolić, J., Banjanac, R., Udovičić, V., "Multivariate analysis of climate variables, teleconnection indices and activities of lead-210 and beryllium-7 in surface air in Belgrade, Serbia" in RAD Conference Proceedings (2014):13-16,
https://hdl.handle.net/21.15107/rcub_veterinar_1149 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Stratimirović, Đorđe
AU  - Đurđević, V.
AU  - Todorović, Dragana
AU  - Nikolić, J.
PY  - 2014
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1130
AB  - Activities of beryllium-7 and lead-210 are monitored in ground level air in Belgrade, Serbia. The measuring sites are located at the Institute of Nuclear Sciences Vinča. The activities are determined on HPGe detectors by standard gamma spectrometry. Five teleconnection indices of large scale atmospheric circulation: North Atlantic Oscillation, East Atlantic Pattern, East Atlantic/West Russia Pattern, Scandinavia Pattern, and Polar/Eurasia Pattern are obtained from the data archive of the United States National Oceanic and Atmospheric Administration's Climate Prediction Center. The collected time series consist of monthly values and span more than two decades: beryllium-7 since 1991, lead-210 since 1985, and the teleconnection indices since 1950, thus offering data arrays of sufficient lengths for wavelet spectral analysis. A relation between the radionuclides' activities and the indices is first investigated using Pearson's correlation coefficients. The computed coefficients do not indicate a linear relationship between the variables. However, the wavelet spectral analysis shows a number of common characteristic frequencies in the data arrays. The annual cycle of all the variables is clearly evident. A common time period of two to three years is also found, as well as a higher frequency variability corresponding to five to six months.
PB  - RAD Association
C3  - RAD Conference Proceedings
T1  - Wavelet spectral analysis of teleconnection indices and activities of beryllium-7 and lead-210 in ground level air in Belgrade, Serbia
SP  - 53
EP  - 56
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_1130
ER  - 

@conference{
author = "Ajtić, Jelena and Stratimirović, Đorđe and Đurđević, V. and Todorović, Dragana and Nikolić, J.",
year = "2014",
abstract = "Activities of beryllium-7 and lead-210 are monitored in ground level air in Belgrade, Serbia. The measuring sites are located at the Institute of Nuclear Sciences Vinča. The activities are determined on HPGe detectors by standard gamma spectrometry. Five teleconnection indices of large scale atmospheric circulation: North Atlantic Oscillation, East Atlantic Pattern, East Atlantic/West Russia Pattern, Scandinavia Pattern, and Polar/Eurasia Pattern are obtained from the data archive of the United States National Oceanic and Atmospheric Administration's Climate Prediction Center. The collected time series consist of monthly values and span more than two decades: beryllium-7 since 1991, lead-210 since 1985, and the teleconnection indices since 1950, thus offering data arrays of sufficient lengths for wavelet spectral analysis. A relation between the radionuclides' activities and the indices is first investigated using Pearson's correlation coefficients. The computed coefficients do not indicate a linear relationship between the variables. However, the wavelet spectral analysis shows a number of common characteristic frequencies in the data arrays. The annual cycle of all the variables is clearly evident. A common time period of two to three years is also found, as well as a higher frequency variability corresponding to five to six months.",
publisher = "RAD Association",
journal = "RAD Conference Proceedings",
title = "Wavelet spectral analysis of teleconnection indices and activities of beryllium-7 and lead-210 in ground level air in Belgrade, Serbia",
pages = "53-56",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_1130"
}

Ajtić, J., Stratimirović, Đ., Đurđević, V., Todorović, D.,& Nikolić, J.. (2014). Wavelet spectral analysis of teleconnection indices and activities of beryllium-7 and lead-210 in ground level air in Belgrade, Serbia. in RAD Conference Proceedings
RAD Association., 53-56.
https://hdl.handle.net/21.15107/rcub_veterinar_1130

Ajtić J, Stratimirović Đ, Đurđević V, Todorović D, Nikolić J. Wavelet spectral analysis of teleconnection indices and activities of beryllium-7 and lead-210 in ground level air in Belgrade, Serbia. in RAD Conference Proceedings. 2014;:53-56.
https://hdl.handle.net/21.15107/rcub_veterinar_1130 .

Ajtić, Jelena, Stratimirović, Đorđe, Đurđević, V., Todorović, Dragana, Nikolić, J., "Wavelet spectral analysis of teleconnection indices and activities of beryllium-7 and lead-210 in ground level air in Belgrade, Serbia" in RAD Conference Proceedings (2014):53-56,
https://hdl.handle.net/21.15107/rcub_veterinar_1130 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Todorović, Dragana
AU  - Popović, Dragana
AU  - Nikolić, Jelena
PY  - 2013
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2380
AB  - Na dva merna mesta u Beogradu od 2004. do 2012. godine prikupljeni su uzorci aerosola iz
prizemnog sloja atmosfere. Mesečne specifične aktivnosti 7
Be i 210Pb u uzorcima izmerene su
standardnom metodom spektrometrije gama zračenja na HPGe detektorima. Na oba merna mesta, 7
Be i 210Pb su međusobno slabo korelisani, ali između mernih mesta nije nađena korelacija. Povezanost između
merenih aktivnosti i količine padavina takođe nije nađena. Međutim, maksimalne vrednosti aktivnosti u
intervalima količine padavina pokazuju visoku negativnu linearnu korelaciju sa količinom padavina.
AB  - During 2004–2012, samples of aerosols in surface air were collected in two measuring locations in
Belgrade. Monthly specific activities of 7
Be and 210Pb in the samples were determined on HPGE detectors
by standard gamma spectrometry. A weak correlation between the 7
Be and 210Pb activities in each of the
measuring locations, and no correlation between the two sites, is found. The results further show no
correlation between the measured activities and amount of precipitation. However, the maximum
activities corresponding to binned amount of precipitation exhibit relatively high negative linear
correlation.
PB  - Institut za nuklearne nauke „Vinča“
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - Zbornik radova sa XXVII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2013, Vrnjačka Banja, Srbija
T1  - Berilijum-7 i olovo-210: Devet godina monitoringa na dve lokacije u Beogradu
T1  - Beryllium-7 And Lead-210: Nine Years Of Monitoring In Two Locations In Belgrade, Serbia
SP  - 76
EP  - 79
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2380
ER  - 

@conference{
author = "Ajtić, Jelena and Todorović, Dragana and Popović, Dragana and Nikolić, Jelena",
year = "2013",
abstract = "Na dva merna mesta u Beogradu od 2004. do 2012. godine prikupljeni su uzorci aerosola iz
prizemnog sloja atmosfere. Mesečne specifične aktivnosti 7
Be i 210Pb u uzorcima izmerene su
standardnom metodom spektrometrije gama zračenja na HPGe detektorima. Na oba merna mesta, 7
Be i 210Pb su međusobno slabo korelisani, ali između mernih mesta nije nađena korelacija. Povezanost između
merenih aktivnosti i količine padavina takođe nije nađena. Međutim, maksimalne vrednosti aktivnosti u
intervalima količine padavina pokazuju visoku negativnu linearnu korelaciju sa količinom padavina., During 2004–2012, samples of aerosols in surface air were collected in two measuring locations in
Belgrade. Monthly specific activities of 7
Be and 210Pb in the samples were determined on HPGE detectors
by standard gamma spectrometry. A weak correlation between the 7
Be and 210Pb activities in each of the
measuring locations, and no correlation between the two sites, is found. The results further show no
correlation between the measured activities and amount of precipitation. However, the maximum
activities corresponding to binned amount of precipitation exhibit relatively high negative linear
correlation.",
publisher = "Institut za nuklearne nauke „Vinča“, Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "Zbornik radova sa XXVII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2013, Vrnjačka Banja, Srbija",
title = "Berilijum-7 i olovo-210: Devet godina monitoringa na dve lokacije u Beogradu, Beryllium-7 And Lead-210: Nine Years Of Monitoring In Two Locations In Belgrade, Serbia",
pages = "76-79",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2380"
}

Ajtić, J., Todorović, D., Popović, D.,& Nikolić, J.. (2013). Berilijum-7 i olovo-210: Devet godina monitoringa na dve lokacije u Beogradu. in Zbornik radova sa XXVII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2013, Vrnjačka Banja, Srbija
Institut za nuklearne nauke „Vinča“., 76-79.
https://hdl.handle.net/21.15107/rcub_veterinar_2380

Ajtić J, Todorović D, Popović D, Nikolić J. Berilijum-7 i olovo-210: Devet godina monitoringa na dve lokacije u Beogradu. in Zbornik radova sa XXVII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2013, Vrnjačka Banja, Srbija. 2013;:76-79.
https://hdl.handle.net/21.15107/rcub_veterinar_2380 .

Ajtić, Jelena, Todorović, Dragana, Popović, Dragana, Nikolić, Jelena, "Berilijum-7 i olovo-210: Devet godina monitoringa na dve lokacije u Beogradu" in Zbornik radova sa XXVII Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2013, Vrnjačka Banja, Srbija (2013):76-79,
https://hdl.handle.net/21.15107/rcub_veterinar_2380 .

TY  - CONF
AU  - Vukašinović, Ivana
AU  - Todorović, Dragana
AU  - Nikolić, Jelena
AU  - Popović, Dragana
AU  - Ajtić, Jelena
PY  - 2013
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2368
AB  - The paper presents the results of activity concentration (Bqkg-1) determination
of natural (238U, 226Ra, 232Th, 40K, 210Pb) and man-made (137Cs) radionuclides in soils
of urban area (Belgrade city parks). Main soil physical and chemical properties
(pH value, particle size distribution, organic matter and carbonates percentages)
were also determined. Soils that were classified as Anthrosols are characterised by
a strong influence of human activities and therefore becomes the main concern
due to their impact on human health and environment.
In May of 2011, soil samples were collected from four city parks: Studentski
Park (SP), Botanicka Basta (BB), Zemunski Park (ZP) and Karadjordjev Park
(KP). At each site, composite samples were taken mixing three subsamples
from soil bellow the tree crowns and from soil of an open area not sheltered
by the tree branches. Soil under the trees was sampled at each 10 cm up to 50
cm depth (except at the KP site up to 30 cm) and at an open area from the first
10 cm.
Soil samples were air – dried, sieved, packed in 500 ml Marinelli beakers and
kept sealed for one month to attain radioactive equilibrium between 238U, 232Th
and their progenies. Measurement of radionuclides activity concentration in
soil samples were done by standard gamma spectrometry using HPGe detector
(CANBERRA, relative efficiency 20%).
Radioisotope activities (Bqkg-1) are in the range of 14-46 for 238U, 1.2-3.4 for 235U, 33-50 for 226Ra, 29-63 for 210Pb, 28-50 for 232Th, 424-576 for 40K and 0.7-36
for 137Cs. The obtained values of radionuclides activity concentration are in agreement with the values for background gamma radiation reported in previous studies for soils in Serbia [1, 2].
Coefficient of variation of natural radionuclides content (238U, 226Ra, 210Pb, 232Th
and 40K) is within experimental uncertainty of their activity determination, estimated to be 25%. At each site, 137Cs varies significantly along the soil depth and
among sites with total coefficient of variation 92%. 238U series activity ratios 226Ra/238U and 210Pb/226Ra were calculated referred to
quite immobile 226Ra nuclide that stays constant down the soil depth [2] and no
important disturbances from radioactive equilibrium in soil were found [3].
At each location, for natural radionuclides (except 210Pb) slightly higher activity concentration was noticed in the first layer of soil (0-10 cm) taken from soil of
an open area compared to the same layer taken under the tree crown. This could
be explained by the fact that main pathway of natural radionuclides accumulation
in leaves is through resuspension from soils [1] and since tree’s foliage is regularly
removed from the parks, part of soil radioactivity could be lost.
PB  - Beograd : Srpsko hemijsko društvo
C3  - Abstracts of the 6th Symposium Chemistry and Environmental Protection with international participation, May 21–24, 2013, Vršac, Serbia
T1  - Contents of radionuclides in soil of urban area (Belgrade city parks)
SP  - 128
EP  - 129
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2368
ER  - 

@conference{
author = "Vukašinović, Ivana and Todorović, Dragana and Nikolić, Jelena and Popović, Dragana and Ajtić, Jelena",
year = "2013",
abstract = "The paper presents the results of activity concentration (Bqkg-1) determination
of natural (238U, 226Ra, 232Th, 40K, 210Pb) and man-made (137Cs) radionuclides in soils
of urban area (Belgrade city parks). Main soil physical and chemical properties
(pH value, particle size distribution, organic matter and carbonates percentages)
were also determined. Soils that were classified as Anthrosols are characterised by
a strong influence of human activities and therefore becomes the main concern
due to their impact on human health and environment.
In May of 2011, soil samples were collected from four city parks: Studentski
Park (SP), Botanicka Basta (BB), Zemunski Park (ZP) and Karadjordjev Park
(KP). At each site, composite samples were taken mixing three subsamples
from soil bellow the tree crowns and from soil of an open area not sheltered
by the tree branches. Soil under the trees was sampled at each 10 cm up to 50
cm depth (except at the KP site up to 30 cm) and at an open area from the first
10 cm.
Soil samples were air – dried, sieved, packed in 500 ml Marinelli beakers and
kept sealed for one month to attain radioactive equilibrium between 238U, 232Th
and their progenies. Measurement of radionuclides activity concentration in
soil samples were done by standard gamma spectrometry using HPGe detector
(CANBERRA, relative efficiency 20%).
Radioisotope activities (Bqkg-1) are in the range of 14-46 for 238U, 1.2-3.4 for 235U, 33-50 for 226Ra, 29-63 for 210Pb, 28-50 for 232Th, 424-576 for 40K and 0.7-36
for 137Cs. The obtained values of radionuclides activity concentration are in agreement with the values for background gamma radiation reported in previous studies for soils in Serbia [1, 2].
Coefficient of variation of natural radionuclides content (238U, 226Ra, 210Pb, 232Th
and 40K) is within experimental uncertainty of their activity determination, estimated to be 25%. At each site, 137Cs varies significantly along the soil depth and
among sites with total coefficient of variation 92%. 238U series activity ratios 226Ra/238U and 210Pb/226Ra were calculated referred to
quite immobile 226Ra nuclide that stays constant down the soil depth [2] and no
important disturbances from radioactive equilibrium in soil were found [3].
At each location, for natural radionuclides (except 210Pb) slightly higher activity concentration was noticed in the first layer of soil (0-10 cm) taken from soil of
an open area compared to the same layer taken under the tree crown. This could
be explained by the fact that main pathway of natural radionuclides accumulation
in leaves is through resuspension from soils [1] and since tree’s foliage is regularly
removed from the parks, part of soil radioactivity could be lost.",
publisher = "Beograd : Srpsko hemijsko društvo",
journal = "Abstracts of the 6th Symposium Chemistry and Environmental Protection with international participation, May 21–24, 2013, Vršac, Serbia",
title = "Contents of radionuclides in soil of urban area (Belgrade city parks)",
pages = "128-129",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2368"
}

Vukašinović, I., Todorović, D., Nikolić, J., Popović, D.,& Ajtić, J.. (2013). Contents of radionuclides in soil of urban area (Belgrade city parks). in Abstracts of the 6th Symposium Chemistry and Environmental Protection with international participation, May 21–24, 2013, Vršac, Serbia
Beograd : Srpsko hemijsko društvo., 128-129.
https://hdl.handle.net/21.15107/rcub_veterinar_2368

Vukašinović I, Todorović D, Nikolić J, Popović D, Ajtić J. Contents of radionuclides in soil of urban area (Belgrade city parks). in Abstracts of the 6th Symposium Chemistry and Environmental Protection with international participation, May 21–24, 2013, Vršac, Serbia. 2013;:128-129.
https://hdl.handle.net/21.15107/rcub_veterinar_2368 .

Vukašinović, Ivana, Todorović, Dragana, Nikolić, Jelena, Popović, Dragana, Ajtić, Jelena, "Contents of radionuclides in soil of urban area (Belgrade city parks)" in Abstracts of the 6th Symposium Chemistry and Environmental Protection with international participation, May 21–24, 2013, Vršac, Serbia (2013):128-129,
https://hdl.handle.net/21.15107/rcub_veterinar_2368 .

TY  - JOUR
AU  - Ajtić, Jelena
AU  - Todorović, Dragana
AU  - Nikolić, Jelena D.
AU  - Đurđević, Vladimir S.
PY  - 2013
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1079
AB  - Activities of 7Be and 210Pb were monitored in surface air in Belgrade, Serbia, from 2004 to 2012. The measurements were taken from two locations, in an open field of a city suburb and in the central city area. The activities were determined on HPGe detectors by standard gamma spectrometry. The 7Be activity shows a pronounced seasonal pattern, with the maximum in spring-summer and minimum in winter, while the 210Pb activity exhibits two maxima, in autumn and late winter. The mean monthly concentrations measured at both sites are below 9 mBq/m3 and 1.3 mBq/m3 for 7Be and 210Pb, respectively. The obtained correlation of the 7Be activity with the number of sun-spots is not statistically significant. Relations of the radionuclides' activities with climate variables (precipitation, temperature, relative humidity, cloud cover, sunshine hours, and atmospheric pressure) are also investigated, but the only significant correlations are found for the 7Be activity with temperature and sunshine hours, and the 210Pb activity with atmospheric pressure. The maximum 7Be and 210Pb activities corresponding to binned total monthly precipitation data imply different modes of the radionuclide scavenging from the atmosphere. During dry periods, accumulation of the radionuclides in the atmosphere leads to their increased activities, but no correlation was found between the activities and the number of consecutive dry days.
AB  - Aktivnosti 7Be i 210Pb merene su tokom 2004-2012, u prizemnom sloju atmosfere na dve lokacije u Beogradu. Mesečne specifične aktivnosti određene su standardnom metodom spektrometrije gama zračenja na HPGe detektorima. Aktivnosti radionuklida pokazuju sezonski karakter: 7Be ima maksimum tokom proleća i leta, a minimum zimi, dok 210Pb ima dva maksimuma, tokom jeseni i kasne zime. Na obe lokacije, srednje mesečne aktivnosti 7Be su manje od 9 mBq/m3, dok su za 210Pb manje od 1.3 mBq/m3. Između aktivnosti 7Be i broja sunčevih pega nije nađena statistički značajna korelacija. Relacije između aktivnosti ovih radionuklida i klimatskih parametara (količina padavina, temperatura, relativna vlažnost, oblačnost, broj sunčanih sati i atmosferski pritisak) takođe su ispitane, ali su značajne korelacije dobijene samo za aktivnost 7Be sa temperaturom i brojem sunčanih sati, odnosno za aktivnost 210Pb sa atmosferskim pritiskom. Na osnovu veze između maksimalne aktivnosti po intervalima količine padavina, mogu se razlikovati tri režima spiranja radionuklida iz atmosfere. Tokom sušnih perioda, akumulacija radionuklida u atmosferi uzrokuje njihovu povišenu aktivnost, ali korelacija između aktivnosti i broja uzastopnih suvih dana nije dobijena.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Nuclear Technology and Radiation Protection
T1  - A multi-year study of radioactivity in surface air and its relation to climate variables in Belgrade, Serbia
T1  - Višegodišnja studija radioaktivnosti u prizemnom sloju atmosfere u relaciji sa klimatskim parametrima u Beogradu, Srbija
VL  - 28
IS  - 4
SP  - 381
EP  - 388
DO  - 10.2298/NTRP1304381A
ER  - 

@article{
author = "Ajtić, Jelena and Todorović, Dragana and Nikolić, Jelena D. and Đurđević, Vladimir S.",
year = "2013",
abstract = "Activities of 7Be and 210Pb were monitored in surface air in Belgrade, Serbia, from 2004 to 2012. The measurements were taken from two locations, in an open field of a city suburb and in the central city area. The activities were determined on HPGe detectors by standard gamma spectrometry. The 7Be activity shows a pronounced seasonal pattern, with the maximum in spring-summer and minimum in winter, while the 210Pb activity exhibits two maxima, in autumn and late winter. The mean monthly concentrations measured at both sites are below 9 mBq/m3 and 1.3 mBq/m3 for 7Be and 210Pb, respectively. The obtained correlation of the 7Be activity with the number of sun-spots is not statistically significant. Relations of the radionuclides' activities with climate variables (precipitation, temperature, relative humidity, cloud cover, sunshine hours, and atmospheric pressure) are also investigated, but the only significant correlations are found for the 7Be activity with temperature and sunshine hours, and the 210Pb activity with atmospheric pressure. The maximum 7Be and 210Pb activities corresponding to binned total monthly precipitation data imply different modes of the radionuclide scavenging from the atmosphere. During dry periods, accumulation of the radionuclides in the atmosphere leads to their increased activities, but no correlation was found between the activities and the number of consecutive dry days., Aktivnosti 7Be i 210Pb merene su tokom 2004-2012, u prizemnom sloju atmosfere na dve lokacije u Beogradu. Mesečne specifične aktivnosti određene su standardnom metodom spektrometrije gama zračenja na HPGe detektorima. Aktivnosti radionuklida pokazuju sezonski karakter: 7Be ima maksimum tokom proleća i leta, a minimum zimi, dok 210Pb ima dva maksimuma, tokom jeseni i kasne zime. Na obe lokacije, srednje mesečne aktivnosti 7Be su manje od 9 mBq/m3, dok su za 210Pb manje od 1.3 mBq/m3. Između aktivnosti 7Be i broja sunčevih pega nije nađena statistički značajna korelacija. Relacije između aktivnosti ovih radionuklida i klimatskih parametara (količina padavina, temperatura, relativna vlažnost, oblačnost, broj sunčanih sati i atmosferski pritisak) takođe su ispitane, ali su značajne korelacije dobijene samo za aktivnost 7Be sa temperaturom i brojem sunčanih sati, odnosno za aktivnost 210Pb sa atmosferskim pritiskom. Na osnovu veze između maksimalne aktivnosti po intervalima količine padavina, mogu se razlikovati tri režima spiranja radionuklida iz atmosfere. Tokom sušnih perioda, akumulacija radionuklida u atmosferi uzrokuje njihovu povišenu aktivnost, ali korelacija između aktivnosti i broja uzastopnih suvih dana nije dobijena.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Nuclear Technology and Radiation Protection",
title = "A multi-year study of radioactivity in surface air and its relation to climate variables in Belgrade, Serbia, Višegodišnja studija radioaktivnosti u prizemnom sloju atmosfere u relaciji sa klimatskim parametrima u Beogradu, Srbija",
volume = "28",
number = "4",
pages = "381-388",
doi = "10.2298/NTRP1304381A"
}

Ajtić, J., Todorović, D., Nikolić, J. D.,& Đurđević, V. S.. (2013). A multi-year study of radioactivity in surface air and its relation to climate variables in Belgrade, Serbia. in Nuclear Technology and Radiation Protection
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 28(4), 381-388.
https://doi.org/10.2298/NTRP1304381A

Ajtić J, Todorović D, Nikolić JD, Đurđević VS. A multi-year study of radioactivity in surface air and its relation to climate variables in Belgrade, Serbia. in Nuclear Technology and Radiation Protection. 2013;28(4):381-388.
doi:10.2298/NTRP1304381A .

Ajtić, Jelena, Todorović, Dragana, Nikolić, Jelena D., Đurđević, Vladimir S., "A multi-year study of radioactivity in surface air and its relation to climate variables in Belgrade, Serbia" in Nuclear Technology and Radiation Protection, 28, no. 4 (2013):381-388,
https://doi.org/10.2298/NTRP1304381A . .

TY  - JOUR
AU  - Todorović, Dragana
AU  - Popović, Dragana
AU  - Ajtić, Jelena
AU  - Nikolić, Jelena
PY  - 2013
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1058
AB  - Leaves of linden (Tilia tomentosa L. and Tilia cordata Mill.) and horse chestnut (Aesculus hippocastanum L.) were analysed as biomonitors of radionuclides in urban air. Samples of soils, leaves and aerosols were collected in Belgrade, Serbia. Activities of Cs-137, K-40, Pb-210 and Be-7 in the samples were measured on an HPGe detector by standard gamma spectrometry. Soil-to-leaves transfer factors were calculated. Students t test and linear Pearson correlation coefficients were used for statistical analysis. Differences in local conditions at the sampling sites were not significant, and the mechanisms of the radionuclides accumulation in both plant species are similar. Ceasium-137 was detected in some of the leaf samples only. Transfer factors for Cs-137 and K-40 were (0.03-0.08) and 1.3, respectively. The concentrations of Pb-210 and Be-7 in leaves were higher in autumn than in spring, and there were some similarities in their seasonal patterns in leaves and in air. Weak to medium correlation was obtained for the Pb-210 and Be-7 activities in leaves and aerosols. Large positive correlation was obtained for the Pb-210 activities in linden leaves and the mean activity in aerosols for the preceding months. Different primary modes of radionuclides accumulation in leaves were observed. Since large positive correlation was obtained for the Pb-210 activity in linden leaves and the mean in aerosols for the preceding months, mature linden leaves could be used as biomonitors of recent Pb-210 activity in air.
PB  - Springer Heidelberg, Heidelberg
T2  - Environmental Science and Pollution Research
T1  - Leaves of higher plants as biomonitors of radionuclides (Cs-137, K-40, Pb-210 and Be-7) in urban air
VL  - 20
IS  - 1
SP  - 525
EP  - 532
DO  - 10.1007/s11356-012-0940-y
ER  - 

@article{
author = "Todorović, Dragana and Popović, Dragana and Ajtić, Jelena and Nikolić, Jelena",
year = "2013",
abstract = "Leaves of linden (Tilia tomentosa L. and Tilia cordata Mill.) and horse chestnut (Aesculus hippocastanum L.) were analysed as biomonitors of radionuclides in urban air. Samples of soils, leaves and aerosols were collected in Belgrade, Serbia. Activities of Cs-137, K-40, Pb-210 and Be-7 in the samples were measured on an HPGe detector by standard gamma spectrometry. Soil-to-leaves transfer factors were calculated. Students t test and linear Pearson correlation coefficients were used for statistical analysis. Differences in local conditions at the sampling sites were not significant, and the mechanisms of the radionuclides accumulation in both plant species are similar. Ceasium-137 was detected in some of the leaf samples only. Transfer factors for Cs-137 and K-40 were (0.03-0.08) and 1.3, respectively. The concentrations of Pb-210 and Be-7 in leaves were higher in autumn than in spring, and there were some similarities in their seasonal patterns in leaves and in air. Weak to medium correlation was obtained for the Pb-210 and Be-7 activities in leaves and aerosols. Large positive correlation was obtained for the Pb-210 activities in linden leaves and the mean activity in aerosols for the preceding months. Different primary modes of radionuclides accumulation in leaves were observed. Since large positive correlation was obtained for the Pb-210 activity in linden leaves and the mean in aerosols for the preceding months, mature linden leaves could be used as biomonitors of recent Pb-210 activity in air.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Environmental Science and Pollution Research",
title = "Leaves of higher plants as biomonitors of radionuclides (Cs-137, K-40, Pb-210 and Be-7) in urban air",
volume = "20",
number = "1",
pages = "525-532",
doi = "10.1007/s11356-012-0940-y"
}

Todorović, D., Popović, D., Ajtić, J.,& Nikolić, J.. (2013). Leaves of higher plants as biomonitors of radionuclides (Cs-137, K-40, Pb-210 and Be-7) in urban air. in Environmental Science and Pollution Research
Springer Heidelberg, Heidelberg., 20(1), 525-532.
https://doi.org/10.1007/s11356-012-0940-y

Todorović D, Popović D, Ajtić J, Nikolić J. Leaves of higher plants as biomonitors of radionuclides (Cs-137, K-40, Pb-210 and Be-7) in urban air. in Environmental Science and Pollution Research. 2013;20(1):525-532.
doi:10.1007/s11356-012-0940-y .

Todorović, Dragana, Popović, Dragana, Ajtić, Jelena, Nikolić, Jelena, "Leaves of higher plants as biomonitors of radionuclides (Cs-137, K-40, Pb-210 and Be-7) in urban air" in Environmental Science and Pollution Research, 20, no. 1 (2013):525-532,
https://doi.org/10.1007/s11356-012-0940-y . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Todorović, Dragana
AU  - Popović, Dragana
AU  - Nikolić, Jelena
PY  - 2012
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2412
AB  - Plants represent an important link in
transport and distribution of radionu
clides, heavy metals, and other pollu
tants in the environment and are often
used as biomonitors of atmospheric pol
lution. In this paper, two deciduous tree
genera, linden (Tilia tomentosa L. and
Tilia cordata Mill.) and chestnut {Aesculus
hippocastanum L), were analysed as
biomonitors of radionuclides in air. The
study was conducted in an urban area
(the city of Belgrade, Serbia), from 2002
to 2009. The activities of radionuclides
in soils, tree leaves and aerosols were
determined on an HPGe detector (Can
berra, relative efficiency 18 %) by stan
dard gamma spectrometry.
The mean activities of 137Cs, 40K,and
210Pb in soils were 34 Bq/kg d.w., 384
Bq/kg dw (dry weight), and 51 Bq/kg
dw, respectively, while their mean acti
vities in linden and chestnut leaves
were 1.8 Bq/kg dw, 498 Bq/kg dw, and
46 Bq/kg dw, respectively. The mean ^Be
activity in leaves was 125 Bq/kg dw. The
activities in aerosols were of order 10-6
Bq/m3 for 137Cs, 10-4 Bq/m3 for 210Pb, and
10-3 Bq/m3 for 7Be.
The calculated ”soil-to-leaves" transfer
factors for 40K and 210Pb were 1.3 and

0.9, respectively. The transfer factor for i
137Cs was close to zero suggesting at-
mospheric deposition as the primary
mode of 137Cs accumulation in leaves.
The 40K activity in leaves decreased towards the end of the growing season, 
reaching around 70 % of the spring
maximum. The concentrations of 210Pb I
and 7Be measured in leaves were both 
higher in autumn than in spring. However, the 210Pb activities increased throughout the growing season, while the
7Be activities reached the maximum in il
summer. 
There were no significant differences in 5
the radionuclides' activities between J
the different sampling sites and between
the tree genera. A strong positive S
correlation for 210Pb activities in linden
leaves and in air during preceding
months was obtained, suggesting that
mature linden leaves could be used as |
biomonitors of recent exposure to 210Pb. i,
The seasonal pattern of the 7Be activity
in leaves partly followed the seasonal
pattern in aerosols, but no large positive a
correlation was found.
PB  - Institute for Radioelements
C3  - Book of Abstracts of the 6th International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology,  June 11–15, Brussels, Belgium
T1  - Air radioactivity Monitoring by Higher Plants
SP  - 56
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2412
ER  - 

@conference{
author = "Ajtić, Jelena and Todorović, Dragana and Popović, Dragana and Nikolić, Jelena",
year = "2012",
abstract = "Plants represent an important link in
transport and distribution of radionu
clides, heavy metals, and other pollu
tants in the environment and are often
used as biomonitors of atmospheric pol
lution. In this paper, two deciduous tree
genera, linden (Tilia tomentosa L. and
Tilia cordata Mill.) and chestnut {Aesculus
hippocastanum L), were analysed as
biomonitors of radionuclides in air. The
study was conducted in an urban area
(the city of Belgrade, Serbia), from 2002
to 2009. The activities of radionuclides
in soils, tree leaves and aerosols were
determined on an HPGe detector (Can
berra, relative efficiency 18 %) by stan
dard gamma spectrometry.
The mean activities of 137Cs, 40K,and
210Pb in soils were 34 Bq/kg d.w., 384
Bq/kg dw (dry weight), and 51 Bq/kg
dw, respectively, while their mean acti
vities in linden and chestnut leaves
were 1.8 Bq/kg dw, 498 Bq/kg dw, and
46 Bq/kg dw, respectively. The mean ^Be
activity in leaves was 125 Bq/kg dw. The
activities in aerosols were of order 10-6
Bq/m3 for 137Cs, 10-4 Bq/m3 for 210Pb, and
10-3 Bq/m3 for 7Be.
The calculated ”soil-to-leaves" transfer
factors for 40K and 210Pb were 1.3 and

0.9, respectively. The transfer factor for i
137Cs was close to zero suggesting at-
mospheric deposition as the primary
mode of 137Cs accumulation in leaves.
The 40K activity in leaves decreased towards the end of the growing season, 
reaching around 70 % of the spring
maximum. The concentrations of 210Pb I
and 7Be measured in leaves were both 
higher in autumn than in spring. However, the 210Pb activities increased throughout the growing season, while the
7Be activities reached the maximum in il
summer. 
There were no significant differences in 5
the radionuclides' activities between J
the different sampling sites and between
the tree genera. A strong positive S
correlation for 210Pb activities in linden
leaves and in air during preceding
months was obtained, suggesting that
mature linden leaves could be used as |
biomonitors of recent exposure to 210Pb. i,
The seasonal pattern of the 7Be activity
in leaves partly followed the seasonal
pattern in aerosols, but no large positive a
correlation was found.",
publisher = "Institute for Radioelements",
journal = "Book of Abstracts of the 6th International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology,  June 11–15, Brussels, Belgium",
title = "Air radioactivity Monitoring by Higher Plants",
pages = "56",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2412"
}

Ajtić, J., Todorović, D., Popović, D.,& Nikolić, J.. (2012). Air radioactivity Monitoring by Higher Plants. in Book of Abstracts of the 6th International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology,  June 11–15, Brussels, Belgium
Institute for Radioelements., 56.
https://hdl.handle.net/21.15107/rcub_veterinar_2412

Ajtić J, Todorović D, Popović D, Nikolić J. Air radioactivity Monitoring by Higher Plants. in Book of Abstracts of the 6th International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology,  June 11–15, Brussels, Belgium. 2012;:56.
https://hdl.handle.net/21.15107/rcub_veterinar_2412 .

Ajtić, Jelena, Todorović, Dragana, Popović, Dragana, Nikolić, Jelena, "Air radioactivity Monitoring by Higher Plants" in Book of Abstracts of the 6th International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology,  June 11–15, Brussels, Belgium (2012):56,
https://hdl.handle.net/21.15107/rcub_veterinar_2412 .

TY  - CONF
AU  - Popović, Dragana
AU  - Todorović, Dragana
AU  - Nikolić, Jelena
AU  - Ajtić, Jelena
PY  - 2012
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2358
AB  - The paper presents the results of environmental risk assessment from natural radionuclides in
soils in Serbia during 1983–2009. Soils were sampled in urban and mountainous areas, around several
coal power plants, at an experimental farm, and in the region exposed to depleted uranium ammunition in
1999. External dose rates, radium equivalent activities, external hazard indices, and annual effective doses
are calculated and the environmental risk from natural radionuclides in soils is estimated.
PB  - Niš : University of Niš, Faculty of Electronic Engineering
C3  - Proceedings of the First International Conference on Radiation and Dosimetry in Various Fields of Research, April 25–27, 2012, Niš, Serbia
T1  - Natural radionuclides in soils in Serbia: Dose calculations and environmental risk assessment
SP  - 301
EP  - 304
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2358
ER  - 

@conference{
author = "Popović, Dragana and Todorović, Dragana and Nikolić, Jelena and Ajtić, Jelena",
year = "2012",
abstract = "The paper presents the results of environmental risk assessment from natural radionuclides in
soils in Serbia during 1983–2009. Soils were sampled in urban and mountainous areas, around several
coal power plants, at an experimental farm, and in the region exposed to depleted uranium ammunition in
1999. External dose rates, radium equivalent activities, external hazard indices, and annual effective doses
are calculated and the environmental risk from natural radionuclides in soils is estimated.",
publisher = "Niš : University of Niš, Faculty of Electronic Engineering",
journal = "Proceedings of the First International Conference on Radiation and Dosimetry in Various Fields of Research, April 25–27, 2012, Niš, Serbia",
title = "Natural radionuclides in soils in Serbia: Dose calculations and environmental risk assessment",
pages = "301-304",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2358"
}

Popović, D., Todorović, D., Nikolić, J.,& Ajtić, J.. (2012). Natural radionuclides in soils in Serbia: Dose calculations and environmental risk assessment. in Proceedings of the First International Conference on Radiation and Dosimetry in Various Fields of Research, April 25–27, 2012, Niš, Serbia
Niš : University of Niš, Faculty of Electronic Engineering., 301-304.
https://hdl.handle.net/21.15107/rcub_veterinar_2358

Popović D, Todorović D, Nikolić J, Ajtić J. Natural radionuclides in soils in Serbia: Dose calculations and environmental risk assessment. in Proceedings of the First International Conference on Radiation and Dosimetry in Various Fields of Research, April 25–27, 2012, Niš, Serbia. 2012;:301-304.
https://hdl.handle.net/21.15107/rcub_veterinar_2358 .

Popović, Dragana, Todorović, Dragana, Nikolić, Jelena, Ajtić, Jelena, "Natural radionuclides in soils in Serbia: Dose calculations and environmental risk assessment" in Proceedings of the First International Conference on Radiation and Dosimetry in Various Fields of Research, April 25–27, 2012, Niš, Serbia (2012):301-304,
https://hdl.handle.net/21.15107/rcub_veterinar_2358 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Todorović, Dragana
AU  - Popović, Dragana
AU  - Nikolić, Jelena
PY  - 2011
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2381
AB  - U radu su prikazani rezultati analize dve vrste listopadnog drveća, lipe (Tilia tomentosa
L. i Tilia cordata Mill.) i kestena (Aesculus hippocastanum L.), kao mogućih
biomonitora radionuklida 210Pb i 7Be u vazduhu. Studija je sprovedena tokom 2002. –
2009. godine, u tri parka na području Beograda. Aktivnosti 210Pb i 7Be u uzorcima lišća i
aerosola su odreñene na HPGe detektoru standardnom metodom spektrometrije gama
zračenja. Značajne razlike u aktivnostima izmeñu mernih lokacija i vrsta drveća nisu
uočene, odakle se može zaključiti da je uticaj mikro klime, nivoa zagañenja i fizioloških
karakteristika tipova drveća na akumulaciju radionuklida u lišću zanemarljiv. Aktivnosti
radionuklida u lišću i u aerosolima su korelisane koristeći linearne Pirsonove
koeficijente. Kako lišće lipe daje informaciju o istoriji aktivnosti 210Pb u vazduhu, ono se
može koristiti kao biomonitor ovog radionuklida. Za aktivnosti 7Be u lišću i u vazduhu
nisu dobijene značajne pozitivne korelacije.
AB  - Two deciduous tree genera, linden (Tilia tomentosa L. and Tilia cordata Mill.) and
chestnut (Aesculus hippocastanum L.), are analysed as biomonitors of 210Pb and 7Be in
air. In a multiyear study (2002 – 2009), conducted in three city parks in Belgrade, the
content of 210Pb and 7Be in samples of leaves of linden and chestnut trees, and aerosols
was determined on an HPGe detector by standard gamma spectrometry. The differences
seen in the radionuclides’ activities across the measurement sites and between the tree genera are not significant, suggesting that the micro climate, level of air pollution and
physiological characteristics of the trees have a negligible effect on the radionuclides’
activities in leaves. Linear Pearson’s correlation coefficients are used to correlate the
210Pb and 7Be activities in aerosols and in leaves. The results show that linden could be
used as a 210Pb biomonitor which provides information on the recent history of exposure.
No large positive correlation is found for the 7Be activities in leaves and aerosols,
indicating that higher plants are not a suitable biomonitor for this radionuclide.
PB  - Beograd : Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - Zbornik radova sa XXVI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 12–14. oktobar, 2011, Tara, Srbija
T1  - Više biljke kao biomonitori radionuklida u urbanom vazduhu
T1  - Higer plants as biomonitors of radionuclides in urban air
SP  - 55
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2381
ER  - 

@conference{
author = "Ajtić, Jelena and Todorović, Dragana and Popović, Dragana and Nikolić, Jelena",
year = "2011",
abstract = "U radu su prikazani rezultati analize dve vrste listopadnog drveća, lipe (Tilia tomentosa
L. i Tilia cordata Mill.) i kestena (Aesculus hippocastanum L.), kao mogućih
biomonitora radionuklida 210Pb i 7Be u vazduhu. Studija je sprovedena tokom 2002. –
2009. godine, u tri parka na području Beograda. Aktivnosti 210Pb i 7Be u uzorcima lišća i
aerosola su odreñene na HPGe detektoru standardnom metodom spektrometrije gama
zračenja. Značajne razlike u aktivnostima izmeñu mernih lokacija i vrsta drveća nisu
uočene, odakle se može zaključiti da je uticaj mikro klime, nivoa zagañenja i fizioloških
karakteristika tipova drveća na akumulaciju radionuklida u lišću zanemarljiv. Aktivnosti
radionuklida u lišću i u aerosolima su korelisane koristeći linearne Pirsonove
koeficijente. Kako lišće lipe daje informaciju o istoriji aktivnosti 210Pb u vazduhu, ono se
može koristiti kao biomonitor ovog radionuklida. Za aktivnosti 7Be u lišću i u vazduhu
nisu dobijene značajne pozitivne korelacije., Two deciduous tree genera, linden (Tilia tomentosa L. and Tilia cordata Mill.) and
chestnut (Aesculus hippocastanum L.), are analysed as biomonitors of 210Pb and 7Be in
air. In a multiyear study (2002 – 2009), conducted in three city parks in Belgrade, the
content of 210Pb and 7Be in samples of leaves of linden and chestnut trees, and aerosols
was determined on an HPGe detector by standard gamma spectrometry. The differences
seen in the radionuclides’ activities across the measurement sites and between the tree genera are not significant, suggesting that the micro climate, level of air pollution and
physiological characteristics of the trees have a negligible effect on the radionuclides’
activities in leaves. Linear Pearson’s correlation coefficients are used to correlate the
210Pb and 7Be activities in aerosols and in leaves. The results show that linden could be
used as a 210Pb biomonitor which provides information on the recent history of exposure.
No large positive correlation is found for the 7Be activities in leaves and aerosols,
indicating that higher plants are not a suitable biomonitor for this radionuclide.",
publisher = "Beograd : Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "Zbornik radova sa XXVI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 12–14. oktobar, 2011, Tara, Srbija",
title = "Više biljke kao biomonitori radionuklida u urbanom vazduhu, Higer plants as biomonitors of radionuclides in urban air",
pages = "55-59",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2381"
}

Ajtić, J., Todorović, D., Popović, D.,& Nikolić, J.. (2011). Više biljke kao biomonitori radionuklida u urbanom vazduhu. in Zbornik radova sa XXVI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 12–14. oktobar, 2011, Tara, Srbija
Beograd : Institut za nuklearne nauke "Vinča"., 55-59.
https://hdl.handle.net/21.15107/rcub_veterinar_2381

Ajtić J, Todorović D, Popović D, Nikolić J. Više biljke kao biomonitori radionuklida u urbanom vazduhu. in Zbornik radova sa XXVI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 12–14. oktobar, 2011, Tara, Srbija. 2011;:55-59.
https://hdl.handle.net/21.15107/rcub_veterinar_2381 .

Ajtić, Jelena, Todorović, Dragana, Popović, Dragana, Nikolić, Jelena, "Više biljke kao biomonitori radionuklida u urbanom vazduhu" in Zbornik radova sa XXVI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 12–14. oktobar, 2011, Tara, Srbija (2011):55-59,
https://hdl.handle.net/21.15107/rcub_veterinar_2381 .

TY  - BOOK
AU  - Popović, Dragana
AU  - Todorović, Dragana
AU  - Aničić, Mira
AU  - Tomašević, Milica
AU  - Nikolić, Jelena
AU  - Ajtić, Jelena
PY  - 2010
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2441
AB  - In urban areas, air quality is strongly influenced by numerous anthropogenic activities.
High population density, heavy traffic and domestic heating in winters in the centre, and
various industrial activities at the outskirts, influence atmospheric concentrations of trace
elements and radionuclides. Consequently, large population is exposed to possible adverse
effects arising from the altered urban air composition. Therefore, air quality monitoring has
become one of the standard quality control procedures in urban areas.
PB  - Intechopen
T1  - Trace Elements and Radionuclides in Urban Air Monitored by Moss and Tree Leaves
DO  - 10.5772/9755
ER  - 

@book{
author = "Popović, Dragana and Todorović, Dragana and Aničić, Mira and Tomašević, Milica and Nikolić, Jelena and Ajtić, Jelena",
year = "2010",
abstract = "In urban areas, air quality is strongly influenced by numerous anthropogenic activities.
High population density, heavy traffic and domestic heating in winters in the centre, and
various industrial activities at the outskirts, influence atmospheric concentrations of trace
elements and radionuclides. Consequently, large population is exposed to possible adverse
effects arising from the altered urban air composition. Therefore, air quality monitoring has
become one of the standard quality control procedures in urban areas.",
publisher = "Intechopen",
title = "Trace Elements and Radionuclides in Urban Air Monitored by Moss and Tree Leaves",
doi = "10.5772/9755"
}

Popović, D., Todorović, D., Aničić, M., Tomašević, M., Nikolić, J.,& Ajtić, J.. (2010). Trace Elements and Radionuclides in Urban Air Monitored by Moss and Tree Leaves. 
Intechopen..
https://doi.org/10.5772/9755

Popović D, Todorović D, Aničić M, Tomašević M, Nikolić J, Ajtić J. Trace Elements and Radionuclides in Urban Air Monitored by Moss and Tree Leaves. 2010;.
doi:10.5772/9755 .

Popović, Dragana, Todorović, Dragana, Aničić, Mira, Tomašević, Milica, Nikolić, Jelena, Ajtić, Jelena, "Trace Elements and Radionuclides in Urban Air Monitored by Moss and Tree Leaves" (2010),
https://doi.org/10.5772/9755 . .

TY  - JOUR
AU  - Todorović, Dragana
AU  - Popović, Dragana
AU  - Nikolić, Jelena
AU  - Ajtić, Jelena
PY  - 2010
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/730
AB  - Concentrations of beryllium-7 (Be-7), lead-210 (Pb-210) and caesium-137 (Cs-137) were measured at two sites in the city of Belgrade (Serbia). One monitoring site was located in the central city area with heavy traffic and the other within the Institute of Nuclear Sciences Vinca, in the suburbs. Presented data cover the period 2004-9. Activity of the radionuclides was determined on an HPGe detector (Canberra, relative efficiency 23%) by standard gamma spectrometry. Activities of Be-7 and Pb-210 exhibit a similar seasonal pattern. The mean monthly concentrations of Be-7 did not exceed 7 mBq m(-3). The maxima are correlated with the seasonal increase in temperature, whereas the minima are linearly correlated with the amount of precipitation. The activity of Pb-210 was below 0.9 mBq m(-3). The activities of both radionuclides were very low in winters and were largely affected by precipitation and snow coverage. Concentrations of Cs-137 were mainly below the limit of detection.
PB  - Oxford Univ Press, Oxford
T2  - Radiation Protection Dosimetry
T1  - Radioactivity monitoring in ground level air in Belgrade urban area
VL  - 142
IS  - 2-4
SP  - 308
EP  - 313
DO  - 10.1093/rpd/ncq211
ER  - 

@article{
author = "Todorović, Dragana and Popović, Dragana and Nikolić, Jelena and Ajtić, Jelena",
year = "2010",
abstract = "Concentrations of beryllium-7 (Be-7), lead-210 (Pb-210) and caesium-137 (Cs-137) were measured at two sites in the city of Belgrade (Serbia). One monitoring site was located in the central city area with heavy traffic and the other within the Institute of Nuclear Sciences Vinca, in the suburbs. Presented data cover the period 2004-9. Activity of the radionuclides was determined on an HPGe detector (Canberra, relative efficiency 23%) by standard gamma spectrometry. Activities of Be-7 and Pb-210 exhibit a similar seasonal pattern. The mean monthly concentrations of Be-7 did not exceed 7 mBq m(-3). The maxima are correlated with the seasonal increase in temperature, whereas the minima are linearly correlated with the amount of precipitation. The activity of Pb-210 was below 0.9 mBq m(-3). The activities of both radionuclides were very low in winters and were largely affected by precipitation and snow coverage. Concentrations of Cs-137 were mainly below the limit of detection.",
publisher = "Oxford Univ Press, Oxford",
journal = "Radiation Protection Dosimetry",
title = "Radioactivity monitoring in ground level air in Belgrade urban area",
volume = "142",
number = "2-4",
pages = "308-313",
doi = "10.1093/rpd/ncq211"
}

Todorović, D., Popović, D., Nikolić, J.,& Ajtić, J.. (2010). Radioactivity monitoring in ground level air in Belgrade urban area. in Radiation Protection Dosimetry
Oxford Univ Press, Oxford., 142(2-4), 308-313.
https://doi.org/10.1093/rpd/ncq211

Todorović D, Popović D, Nikolić J, Ajtić J. Radioactivity monitoring in ground level air in Belgrade urban area. in Radiation Protection Dosimetry. 2010;142(2-4):308-313.
doi:10.1093/rpd/ncq211 .

Todorović, Dragana, Popović, Dragana, Nikolić, Jelena, Ajtić, Jelena, "Radioactivity monitoring in ground level air in Belgrade urban area" in Radiation Protection Dosimetry, 142, no. 2-4 (2010):308-313,
https://doi.org/10.1093/rpd/ncq211 . .

TY  - JOUR
AU  - Popović, Dragana
AU  - Božić, Tatjana
AU  - Stevanović, Jelka
AU  - Frontasyeva, Marina
AU  - Todorović, Dragana
AU  - Ajtić, Jelena
AU  - Spasić-Jokić, Vesna
PY  - 2010
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/718
AB  - Background, aim and scope The paper presents concentrations of trace elements in blood of homebred animals (cows and sheep) from Southern Serbia (Bujanovac) and the contents of natural and anthropogenic radionuclides and some heavy metals in feed. The region of Southern Serbia was exposed to contamination by depleted uranium ammunition during NATO attacks in 1999 and therefore, is of great concern to environmental pollution and human and animal health. Materials and methods Conventional instrumental and epithermal neutron activation analyses are used to measure trace elements in cow and sheep blood samples collected randomly at six locations in the region of Bujanovac (village of Borovac) in the spring of 2005. Samples of feed (grass and crops: corn, wheat and oats), collected on the same locations (households), are analysed for the contents of radionuclides on an HPGe detector (Ortec, relative efficiency 23%) by standard gamma spectrometry. The content of Hg, Pb and Cd in feed is determined by standard atomic absorption spectrometry on the VarianSpectra220/ThermoSolar GFS97 spectrometer. Results Concentrations of 29 elements (Na, Al (P), Cl, K, Sc, Cr, Mn, Ni, Fe, Co, Zn, Se, As, Br, Sr, Rb, Sb, In, I, Ba, Cs, La, Nd, Eu, Sm, Tb, Hf, Ta and Th) are determined in blood of the examined animals. In feeds, natural 40K is found in all of the samples, cosmogenic Be-7 and fission product Cs-137 are detected only in the grass samples, while heavy metals Hg, Cd and Pb are found in the range of 0.01-0.02, 0.84-1.15 and 0.74-7.34 mg/kg, respectively. Calculated soil-to-blood transfer factors are in a wide range of 8.10(-6) to 64, as a result of varying significance of the elements in animal metabolism and feeding habits. Discussion The results of trace elements concentrations in animal blood are in good agreement with available data for K, Ni, Zn, Se and Rb. Higher Br concentrations in animal blood are most probably caused by large biomass burning events during blood sampling. Very low concentration of Fe in cows and sheep confirms the results of previous biochemical studies on animal anaemia in the region. High concentration of As correlates with geochemical peculiarities of the Balkans and is also likely influenced by the use of pesticides in the agricultural production. For some of the elements (La, Nd, Eu, Sm, Tb, Sb, Hf, Ta, Th, In, Ba, Sr, Sc and Cs), there are few or no literature data. Therefore, some of the presented data are significant not only for the country and the region, but on a wider scale. Activities of natural radionuclides in feeds are within the average values reported for the region, while the activities of Pb-210 and U-235/238 are below the limit of detection. This is in accordance with previous investigations showing no widespread contamination by depleted uranium in the area. Contents of Hg and Pb in feeds are below the nationally permissible levels, unlike the content of Cd which exceeds it, probably caused by the use of phosphate fertilisers and fossil fuel combustion in the area. Conclusions In general, the concentrations of trace elements in blood of homebred cows and sheep are in good agreement with reference materials, available literature data and the results of previous studies in the area. The exceptions are Fe, As and Br. The contents of natural and anthropogenic radionuclides in feeds are within the expected levels, and there are no signs of contamination by depleted uranium or other fission products. Apart from Cd, there are no signs of pollution by heavy metals in feeds. The highly sensitive method of instrumental neutron activation analysis provides data on the concentration of some elements in animal blood not previously reported for the region and elsewhere. Recommendations and perspectives The presented study is a part of the long term ongoing project on the health risk assessment on animals and humans in the region. The collected data is intended to provide a base for the animal and human risk assessment as well as an estimate of the general pollution status of the environment in the region. Since some of the investigated elements are classified as important trace elements for livestock, the results could also be used to balance and improve the animal diet and thus, improve the growth and reproduction rate.
PB  - Springer Heidelberg, Heidelberg
T2  - Environmental Science and Pollution Research
T1  - Concentration of trace elements in blood and feed of homebred animals in Southern Serbia
VL  - 17
IS  - 5
SP  - 1119
EP  - 1128
DO  - 10.1007/s11356-009-0274-6
ER  - 

@article{
author = "Popović, Dragana and Božić, Tatjana and Stevanović, Jelka and Frontasyeva, Marina and Todorović, Dragana and Ajtić, Jelena and Spasić-Jokić, Vesna",
year = "2010",
abstract = "Background, aim and scope The paper presents concentrations of trace elements in blood of homebred animals (cows and sheep) from Southern Serbia (Bujanovac) and the contents of natural and anthropogenic radionuclides and some heavy metals in feed. The region of Southern Serbia was exposed to contamination by depleted uranium ammunition during NATO attacks in 1999 and therefore, is of great concern to environmental pollution and human and animal health. Materials and methods Conventional instrumental and epithermal neutron activation analyses are used to measure trace elements in cow and sheep blood samples collected randomly at six locations in the region of Bujanovac (village of Borovac) in the spring of 2005. Samples of feed (grass and crops: corn, wheat and oats), collected on the same locations (households), are analysed for the contents of radionuclides on an HPGe detector (Ortec, relative efficiency 23%) by standard gamma spectrometry. The content of Hg, Pb and Cd in feed is determined by standard atomic absorption spectrometry on the VarianSpectra220/ThermoSolar GFS97 spectrometer. Results Concentrations of 29 elements (Na, Al (P), Cl, K, Sc, Cr, Mn, Ni, Fe, Co, Zn, Se, As, Br, Sr, Rb, Sb, In, I, Ba, Cs, La, Nd, Eu, Sm, Tb, Hf, Ta and Th) are determined in blood of the examined animals. In feeds, natural 40K is found in all of the samples, cosmogenic Be-7 and fission product Cs-137 are detected only in the grass samples, while heavy metals Hg, Cd and Pb are found in the range of 0.01-0.02, 0.84-1.15 and 0.74-7.34 mg/kg, respectively. Calculated soil-to-blood transfer factors are in a wide range of 8.10(-6) to 64, as a result of varying significance of the elements in animal metabolism and feeding habits. Discussion The results of trace elements concentrations in animal blood are in good agreement with available data for K, Ni, Zn, Se and Rb. Higher Br concentrations in animal blood are most probably caused by large biomass burning events during blood sampling. Very low concentration of Fe in cows and sheep confirms the results of previous biochemical studies on animal anaemia in the region. High concentration of As correlates with geochemical peculiarities of the Balkans and is also likely influenced by the use of pesticides in the agricultural production. For some of the elements (La, Nd, Eu, Sm, Tb, Sb, Hf, Ta, Th, In, Ba, Sr, Sc and Cs), there are few or no literature data. Therefore, some of the presented data are significant not only for the country and the region, but on a wider scale. Activities of natural radionuclides in feeds are within the average values reported for the region, while the activities of Pb-210 and U-235/238 are below the limit of detection. This is in accordance with previous investigations showing no widespread contamination by depleted uranium in the area. Contents of Hg and Pb in feeds are below the nationally permissible levels, unlike the content of Cd which exceeds it, probably caused by the use of phosphate fertilisers and fossil fuel combustion in the area. Conclusions In general, the concentrations of trace elements in blood of homebred cows and sheep are in good agreement with reference materials, available literature data and the results of previous studies in the area. The exceptions are Fe, As and Br. The contents of natural and anthropogenic radionuclides in feeds are within the expected levels, and there are no signs of contamination by depleted uranium or other fission products. Apart from Cd, there are no signs of pollution by heavy metals in feeds. The highly sensitive method of instrumental neutron activation analysis provides data on the concentration of some elements in animal blood not previously reported for the region and elsewhere. Recommendations and perspectives The presented study is a part of the long term ongoing project on the health risk assessment on animals and humans in the region. The collected data is intended to provide a base for the animal and human risk assessment as well as an estimate of the general pollution status of the environment in the region. Since some of the investigated elements are classified as important trace elements for livestock, the results could also be used to balance and improve the animal diet and thus, improve the growth and reproduction rate.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Environmental Science and Pollution Research",
title = "Concentration of trace elements in blood and feed of homebred animals in Southern Serbia",
volume = "17",
number = "5",
pages = "1119-1128",
doi = "10.1007/s11356-009-0274-6"
}

Popović, D., Božić, T., Stevanović, J., Frontasyeva, M., Todorović, D., Ajtić, J.,& Spasić-Jokić, V.. (2010). Concentration of trace elements in blood and feed of homebred animals in Southern Serbia. in Environmental Science and Pollution Research
Springer Heidelberg, Heidelberg., 17(5), 1119-1128.
https://doi.org/10.1007/s11356-009-0274-6

Popović D, Božić T, Stevanović J, Frontasyeva M, Todorović D, Ajtić J, Spasić-Jokić V. Concentration of trace elements in blood and feed of homebred animals in Southern Serbia. in Environmental Science and Pollution Research. 2010;17(5):1119-1128.
doi:10.1007/s11356-009-0274-6 .

Popović, Dragana, Božić, Tatjana, Stevanović, Jelka, Frontasyeva, Marina, Todorović, Dragana, Ajtić, Jelena, Spasić-Jokić, Vesna, "Concentration of trace elements in blood and feed of homebred animals in Southern Serbia" in Environmental Science and Pollution Research, 17, no. 5 (2010):1119-1128,
https://doi.org/10.1007/s11356-009-0274-6 . .

TY  - CONF
AU  - Todorović, Dragana
AU  - Ajtić, Jelena
AU  - Popović, Dragana
AU  - Nikolić, Jelena
PY  - 2009
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2382
AB  - U radu su prikazani rezultati višegodišnjih istraživanja sadržaja prirodnih (7
Be, 210Pb, 40K) i proizvedenih (137Cs) radionuklida u lišću viših biljaka (lipa, kesten) u gradskom
području Beograda u periodu od 2002. do 2008. godine. Aktivnost radionuklida određena
je na HPGe detektoru standardnom metodom spektrometrije gama zračenja. Istraživanja su
deo tekućeg projekta ispitivanja kvaliteta vazduha u urbanim sredinama na teritoriji
Republike Srbije.
AB  - The results of a long-term study (from 2002 to 2008) on the concentrations of natural
(
7
Be, 210Pb, 40K) and fission (137Cs) radionuclides in leaves of higher plants (linden and
chestnut) in an urban area (city of Belgrade) are presented. The activity of the radionuclides
was determined on an HPGe detector by standard gamma spectrometry. The study is a part
of the ongoing air quality monitoring programme in urban areas in the Republic of Serbia.
PB  - Beograd : Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - Zbornik radova sa XXV Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, Zbornik radova, 30. septembar – 2. oktobar, 2009, Kopaonik, Srbija
T1  - Radionuklidi u biljkama u urbanim sredinama
T1  - Radionuclides in plants in urban areas
SP  - 39
EP  - 42
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2382
ER  - 

@conference{
author = "Todorović, Dragana and Ajtić, Jelena and Popović, Dragana and Nikolić, Jelena",
year = "2009",
abstract = "U radu su prikazani rezultati višegodišnjih istraživanja sadržaja prirodnih (7
Be, 210Pb, 40K) i proizvedenih (137Cs) radionuklida u lišću viših biljaka (lipa, kesten) u gradskom
području Beograda u periodu od 2002. do 2008. godine. Aktivnost radionuklida određena
je na HPGe detektoru standardnom metodom spektrometrije gama zračenja. Istraživanja su
deo tekućeg projekta ispitivanja kvaliteta vazduha u urbanim sredinama na teritoriji
Republike Srbije., The results of a long-term study (from 2002 to 2008) on the concentrations of natural
(
7
Be, 210Pb, 40K) and fission (137Cs) radionuclides in leaves of higher plants (linden and
chestnut) in an urban area (city of Belgrade) are presented. The activity of the radionuclides
was determined on an HPGe detector by standard gamma spectrometry. The study is a part
of the ongoing air quality monitoring programme in urban areas in the Republic of Serbia.",
publisher = "Beograd : Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "Zbornik radova sa XXV Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, Zbornik radova, 30. septembar – 2. oktobar, 2009, Kopaonik, Srbija",
title = "Radionuklidi u biljkama u urbanim sredinama, Radionuclides in plants in urban areas",
pages = "39-42",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2382"
}

Todorović, D., Ajtić, J., Popović, D.,& Nikolić, J.. (2009). Radionuklidi u biljkama u urbanim sredinama. in Zbornik radova sa XXV Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, Zbornik radova, 30. septembar – 2. oktobar, 2009, Kopaonik, Srbija
Beograd : Institut za nuklearne nauke "Vinča"., 39-42.
https://hdl.handle.net/21.15107/rcub_veterinar_2382

Todorović D, Ajtić J, Popović D, Nikolić J. Radionuklidi u biljkama u urbanim sredinama. in Zbornik radova sa XXV Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, Zbornik radova, 30. septembar – 2. oktobar, 2009, Kopaonik, Srbija. 2009;:39-42.
https://hdl.handle.net/21.15107/rcub_veterinar_2382 .

Todorović, Dragana, Ajtić, Jelena, Popović, Dragana, Nikolić, Jelena, "Radionuklidi u biljkama u urbanim sredinama" in Zbornik radova sa XXV Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, Zbornik radova, 30. septembar – 2. oktobar, 2009, Kopaonik, Srbija (2009):39-42,
https://hdl.handle.net/21.15107/rcub_veterinar_2382 .

TY  - JOUR
AU  - Popović, Dragana
AU  - Todorović, Dragana
AU  - Ajtić, Jelena
AU  - Nikolić, Jelena
PY  - 2009
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/650
AB  - To assess the validity of the moss bag monitoring technique in the radioactivity control of ground level urban air, a study on radionuclide contents in moss was performed in the city of Belgrade, Serbia. From May 2006 to May 2007, moss (Sphagnum girgensohni, Dubna, Russia) was exposed to the aero pollution in a location in the central area of the city. The activity of 40K, 210Pb, and 137Cs was measured on an HPGe detector (Canberra, relative efficiency 23%) by standard gamma spectrometry. The activities 245 ± 25 Bq/kg for 40K, 315 ± 34 Bq/kg for 210Pb, and 28 ± 4 Bq/kg for 137Cs are in the range of values reported for the region; the differences are due to the moss species, local climate and measuring technique. Taking into consideration the time of the exposure and appropriate calibration procedure, moss bag biomonitoring could be used as a complementary method for determination of radionuclides in urban air.
AB  - U cilju utvrđivanja valjanosti tehnike aktivnog monitoringa pomoću mahovina u kontroli radioaktivnosti prizemnog sloja atmosfere, na teritoriji grada Beograda sprovedena je studija sadržaja radionuklida u mahovinama. Od maja 2006. do maja 2007. godine, mahovina (Sphagnum girgensohni, Dubna, Rusija) izlagana je vazdušnom zagađenju na lokaciji u centru grada. Koncentracija aktivnosti 40K, 210Pb i 137Cs merena je HPGe detektorom (Canberra, relativne efikasnosti 23%) metodom standardne gama spektrometrije. Koncentracije aktivnosti od 245 ± ± 25 Bq/kg za 40K, 315 ± 34 Bq/kg za 210Pb i 28 ± 4 Bq/kg za 137Cs spadaju u opseg vrednosti izmerenih u regionu; razlike u rezultatima potiču od vrste mahovine, lokalne klime i tehnike merenja. Uzimajući u obzir vreme izlaganja i pravilnu proceduru kalibracije, aktivni monitoring mahovinama može da se primeni kao komplementarni metod za određivanje koncentracije radionuklida u vazduhu u urbanom području.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Nuclear Technology and Radiation Protection
T1  - Active biomonitoring of air radioactivity in urban areas
T1  - Aktivni biomonitoring radioaktivnosti vazduha u urbanim sredinama
VL  - 24
IS  - 2
SP  - 100
EP  - 103
DO  - 10.2298/NTRP0902100P
ER  - 

@article{
author = "Popović, Dragana and Todorović, Dragana and Ajtić, Jelena and Nikolić, Jelena",
year = "2009",
abstract = "To assess the validity of the moss bag monitoring technique in the radioactivity control of ground level urban air, a study on radionuclide contents in moss was performed in the city of Belgrade, Serbia. From May 2006 to May 2007, moss (Sphagnum girgensohni, Dubna, Russia) was exposed to the aero pollution in a location in the central area of the city. The activity of 40K, 210Pb, and 137Cs was measured on an HPGe detector (Canberra, relative efficiency 23%) by standard gamma spectrometry. The activities 245 ± 25 Bq/kg for 40K, 315 ± 34 Bq/kg for 210Pb, and 28 ± 4 Bq/kg for 137Cs are in the range of values reported for the region; the differences are due to the moss species, local climate and measuring technique. Taking into consideration the time of the exposure and appropriate calibration procedure, moss bag biomonitoring could be used as a complementary method for determination of radionuclides in urban air., U cilju utvrđivanja valjanosti tehnike aktivnog monitoringa pomoću mahovina u kontroli radioaktivnosti prizemnog sloja atmosfere, na teritoriji grada Beograda sprovedena je studija sadržaja radionuklida u mahovinama. Od maja 2006. do maja 2007. godine, mahovina (Sphagnum girgensohni, Dubna, Rusija) izlagana je vazdušnom zagađenju na lokaciji u centru grada. Koncentracija aktivnosti 40K, 210Pb i 137Cs merena je HPGe detektorom (Canberra, relativne efikasnosti 23%) metodom standardne gama spektrometrije. Koncentracije aktivnosti od 245 ± ± 25 Bq/kg za 40K, 315 ± 34 Bq/kg za 210Pb i 28 ± 4 Bq/kg za 137Cs spadaju u opseg vrednosti izmerenih u regionu; razlike u rezultatima potiču od vrste mahovine, lokalne klime i tehnike merenja. Uzimajući u obzir vreme izlaganja i pravilnu proceduru kalibracije, aktivni monitoring mahovinama može da se primeni kao komplementarni metod za određivanje koncentracije radionuklida u vazduhu u urbanom području.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Nuclear Technology and Radiation Protection",
title = "Active biomonitoring of air radioactivity in urban areas, Aktivni biomonitoring radioaktivnosti vazduha u urbanim sredinama",
volume = "24",
number = "2",
pages = "100-103",
doi = "10.2298/NTRP0902100P"
}

Popović, D., Todorović, D., Ajtić, J.,& Nikolić, J.. (2009). Active biomonitoring of air radioactivity in urban areas. in Nuclear Technology and Radiation Protection
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 24(2), 100-103.
https://doi.org/10.2298/NTRP0902100P

Popović D, Todorović D, Ajtić J, Nikolić J. Active biomonitoring of air radioactivity in urban areas. in Nuclear Technology and Radiation Protection. 2009;24(2):100-103.
doi:10.2298/NTRP0902100P .

Popović, Dragana, Todorović, Dragana, Ajtić, Jelena, Nikolić, Jelena, "Active biomonitoring of air radioactivity in urban areas" in Nuclear Technology and Radiation Protection, 24, no. 2 (2009):100-103,
https://doi.org/10.2298/NTRP0902100P . .

TY  - CONF
AU  - Popović, Dragana
AU  - Todorović, Dragana
AU  - Ajtić, Jelena
PY  - 2008
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2432
AB  - Mosses biomonitoring was used as a complementary method for classic instrumental methods
for air pollution detection and control in the second part of the last century. Since then,
mosses have been used as bioindicators for radioactive contamination of the environment for
global distribution of radionuclides due to nuclear weapons atmospheric tests, for the
assessment of radioactive contamiruition of the environment after the nuclear plant accident in
Chernobyl in 1986, for radioactivity monitoring in the vicinity of nuclear power plants etc.
Mosses and lichen proved to be reliable indicators of contamimition of the environment due to
military' use of depleted uranium in Bosnia and Serbia in the last decade of the 20th century,
too. Today mosses biomonitoring is a part of the air pollution monitoring by heavy metals in
major European cities, as it provide data on anthropogenic pollution in urban area by heavy
metals due to traffic and fossil fuel combustion. Mosses arc used to identify the sources of
pollution as they accumulate elements and therefore provide data on the sources of pollution
sources even after the pollution episode took place. But, as in urban areas mosses are not
often found in quantities sufficient to analyze, the method of active biomonitoring or so called
bag techniques with moss transplantants has been frequently used, The method has a number
of advantages considering the precise exposure time, data on the concentrations of elements,
possibility to choose a location of interest etc.
The paper presents the results of determination of radionuclides contents in mosses in an
urban area (city of Belgrade) that was aimed to assess the validity of the method for
radioactivity evaluation in ground level air. Samples of mosses in plastic bags (Sphagnum
girgensohnii, Russia) were exposed for a year (May 2006 to May 2007) in the central city area
near the local highway. Activity of the radionuclides was measured on HPGe detector
(Canberra, relative efficiency 23 %) by standard gamma spectrometry. The reference
radioactive material IAEA-373 (grass) was used for geometric calibration. Counting time was
58 ks, and total standard error of the method for the detected radionuclide was: 10% for
137Cs, 20% for 210Pb and 16% for 40K.
The obtained mean activities (with standard deviations) were; (28 ± 4) Bq/kg for 137Cs, (245
± 34) Bq/kg for 40K and (315 ± 25) Bq/kg for 2I0Pb. The values were in the range of the
values obtained in mosses originated from the area, with higher values for 2I0Pb probably
due to the vicinity of the highway. The results proved that considering the exposure time and
calibration procedure, moss biomonitoring could be used as a complementary method for
determination of radionuclides in air in urban areas.
PB  - RVB
C3  - Book of Abstracts of the Fourth International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology, October 13–16,Rabat, Morocco
T1  - Mosses as bioindicators of aero pollution in urban areas
VL  - 86
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2432
ER  - 

@conference{
author = "Popović, Dragana and Todorović, Dragana and Ajtić, Jelena",
year = "2008",
abstract = "Mosses biomonitoring was used as a complementary method for classic instrumental methods
for air pollution detection and control in the second part of the last century. Since then,
mosses have been used as bioindicators for radioactive contamination of the environment for
global distribution of radionuclides due to nuclear weapons atmospheric tests, for the
assessment of radioactive contamiruition of the environment after the nuclear plant accident in
Chernobyl in 1986, for radioactivity monitoring in the vicinity of nuclear power plants etc.
Mosses and lichen proved to be reliable indicators of contamimition of the environment due to
military' use of depleted uranium in Bosnia and Serbia in the last decade of the 20th century,
too. Today mosses biomonitoring is a part of the air pollution monitoring by heavy metals in
major European cities, as it provide data on anthropogenic pollution in urban area by heavy
metals due to traffic and fossil fuel combustion. Mosses arc used to identify the sources of
pollution as they accumulate elements and therefore provide data on the sources of pollution
sources even after the pollution episode took place. But, as in urban areas mosses are not
often found in quantities sufficient to analyze, the method of active biomonitoring or so called
bag techniques with moss transplantants has been frequently used, The method has a number
of advantages considering the precise exposure time, data on the concentrations of elements,
possibility to choose a location of interest etc.
The paper presents the results of determination of radionuclides contents in mosses in an
urban area (city of Belgrade) that was aimed to assess the validity of the method for
radioactivity evaluation in ground level air. Samples of mosses in plastic bags (Sphagnum
girgensohnii, Russia) were exposed for a year (May 2006 to May 2007) in the central city area
near the local highway. Activity of the radionuclides was measured on HPGe detector
(Canberra, relative efficiency 23 %) by standard gamma spectrometry. The reference
radioactive material IAEA-373 (grass) was used for geometric calibration. Counting time was
58 ks, and total standard error of the method for the detected radionuclide was: 10% for
137Cs, 20% for 210Pb and 16% for 40K.
The obtained mean activities (with standard deviations) were; (28 ± 4) Bq/kg for 137Cs, (245
± 34) Bq/kg for 40K and (315 ± 25) Bq/kg for 2I0Pb. The values were in the range of the
values obtained in mosses originated from the area, with higher values for 2I0Pb probably
due to the vicinity of the highway. The results proved that considering the exposure time and
calibration procedure, moss biomonitoring could be used as a complementary method for
determination of radionuclides in air in urban areas.",
publisher = "RVB",
journal = "Book of Abstracts of the Fourth International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology, October 13–16,Rabat, Morocco",
title = "Mosses as bioindicators of aero pollution in urban areas",
volume = "86",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2432"
}

Popović, D., Todorović, D.,& Ajtić, J.. (2008). Mosses as bioindicators of aero pollution in urban areas. in Book of Abstracts of the Fourth International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology, October 13–16,Rabat, Morocco
RVB., 86.
https://hdl.handle.net/21.15107/rcub_veterinar_2432

Popović D, Todorović D, Ajtić J. Mosses as bioindicators of aero pollution in urban areas. in Book of Abstracts of the Fourth International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology, October 13–16,Rabat, Morocco. 2008;86.
https://hdl.handle.net/21.15107/rcub_veterinar_2432 .

Popović, Dragana, Todorović, Dragana, Ajtić, Jelena, "Mosses as bioindicators of aero pollution in urban areas" in Book of Abstracts of the Fourth International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology, October 13–16,Rabat, Morocco, 86 (2008),
https://hdl.handle.net/21.15107/rcub_veterinar_2432 .