TY  - CONF
AU  - Zorko, Benjamin
AU  - Ajtić, Jelena
AU  - Nečemer, Marijan
AU  - Sarvan, Darko
AU  - Rajačić, Milica
AU  - Korun, Matjaž
AU  - Vodenik, Branko
AU  - Krneta Nikolić, Jelena
AU  - Glavič-Cindro, Denis
AU  - Vukanac, Ivana
AU  - Petrovič, Toni
AU  - Ilić, Zorana
AU  - Vidic, alf
AU  - Didović, Irma
AU  - Janušeski, Jovan
AU  - Anuševa, Jordanka
AU  - Dimovska, Snezana
AU  - Danilovski, Dejan
AU  - Anđelić, Tomislav
AU  - Zekić, Ranko
AU  - Svrkota, Nikola
AU  - Radonjić, Slavko
AU  - Petrinec, Branko
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3271
AB  - Mjerenja koncentracije aktivnosti radionuklida Be-7 (berilij-7), Pb-210 (olovo
210) i Cs-137 (cezij-137) u Zemljinoj atmosferi neophodna su za razumijevanje
atmosferskih procesa, kvalitete zraka i radioaktivnosti okoliša. Berilij-7 je
radioaktivni izotop koji prvenstveno nastaje interakcijom kozmičkih zraka s
atomima dušika i kisika u gornjoj atmosferi. Njegov kratki poluživot čini ga
vrijednim tragačem za atmosferske procese u relativno kratkim vremenskim
razdobljima. Olovo-210 je radioaktivni izotop čiji je primarni izvor u atmosferi
raspad plina radona. S dužim poluživotom od Be-7, pogodan je za proučavanje
dugotrajnijih atmosferskih procesa. Cezij-137 je, s druge strane, antropogeni
radioizotop s vremenom poluraspada čak i dužim od onog Pb-210, što ga
čini dobrim dugoročnim ekološkim tragačem. Nedavno je uspostavljena baza
podataka za praćenje radioaktivnosti tla u zraku (GRAMON). Sadrži rezultate mjerenja radioaktivnosti u površinskom zraku na sedam lokacija: Beograd (Srbija),
Ljubljana i Krško (Slovenija), Sarajevo (Bosna i Hercegovina), Podgorica (Crna
Gora), Skopje i Bitola (Sjeverna Makedonija). Naš rad daje statističku analizu
mjesečnih (prosječnih) vrijednosti koncentracija aktivnosti radionuklida za svaku
lokaciju od 2010. do 2019. Rezultati pokazuju prostorne razlike i vremensku
evoluciju radioaktivnosti zraka u ovoj regiji koja je obično nedovoljno zastupljena
u velikim studijama.
AB  - Measurements of activity concentrations of radionuclides Be-7 (beryllium-7), Pb210 (lead210), and Cs-137 (cesium-137) in the Earth’s atmosphere are essential for
understanding atmospheric processes, air quality, and environmental radioactivity.
Beryllium-7 is a radioactive isotope produced primarily by cosmic ray interactions
with nitrogen and oxygen atoms in the upper atmosphere. Its short half-life makes
it a valuable tracer for atmospheric processes on relatively short timescales. Lead210 is a radioactive isotope whose primary source in the atmosphere is decay
of radon gas. With a longer half-life than Be-7, it is suitable for studying longerterm atmospheric processes. Cesium-137, on the other hand, is an anthropogenic
radioisotope with a half-life even longer than that of Pb-210, which makes it a good
long-term environmental tracer.
The Ground Air Radioactivity Monitoring (GRAMON) database has been recently
established. It contains the outcomes of radioactivity measurements in the surface air at seven locations: Belgrade (Serbia), Ljubljana and Krško (Slovenia),
Sarajevo (Bosnia and Herzegovina), Podgorica (Montenegro), Skopje and Bitola
(North Macedonia). Our paper gives a statistical analysis of monthly (average)
values of the radionuclides’ activity concentrations for each location from 2010
to 2019. The results demonstrate spatial differences and temporal evolution of air
radioactivity over this region commonly underrepresented in large-scale studies.
PB  - Bilje : Javna ustanova „Park prirode Kopački rit“
C3  - 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.
T1  - Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi
T1  - Measurements of Be-7, Pb-210 and Cs-137 activity concentrations in the surface atmosphere
SP  - 250
EP  - 253
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_3271
ER  - 

@conference{
author = "Zorko, Benjamin and Ajtić, Jelena and Nečemer, Marijan and Sarvan, Darko and Rajačić, Milica and Korun, Matjaž and Vodenik, Branko and Krneta Nikolić, Jelena and Glavič-Cindro, Denis and Vukanac, Ivana and Petrovič, Toni and Ilić, Zorana and Vidic, alf and Didović, Irma and Janušeski, Jovan and Anuševa, Jordanka and Dimovska, Snezana and Danilovski, Dejan and Anđelić, Tomislav and Zekić, Ranko and Svrkota, Nikola and Radonjić, Slavko and Petrinec, Branko",
year = "2023",
abstract = "Mjerenja koncentracije aktivnosti radionuklida Be-7 (berilij-7), Pb-210 (olovo
210) i Cs-137 (cezij-137) u Zemljinoj atmosferi neophodna su za razumijevanje
atmosferskih procesa, kvalitete zraka i radioaktivnosti okoliša. Berilij-7 je
radioaktivni izotop koji prvenstveno nastaje interakcijom kozmičkih zraka s
atomima dušika i kisika u gornjoj atmosferi. Njegov kratki poluživot čini ga
vrijednim tragačem za atmosferske procese u relativno kratkim vremenskim
razdobljima. Olovo-210 je radioaktivni izotop čiji je primarni izvor u atmosferi
raspad plina radona. S dužim poluživotom od Be-7, pogodan je za proučavanje
dugotrajnijih atmosferskih procesa. Cezij-137 je, s druge strane, antropogeni
radioizotop s vremenom poluraspada čak i dužim od onog Pb-210, što ga
čini dobrim dugoročnim ekološkim tragačem. Nedavno je uspostavljena baza
podataka za praćenje radioaktivnosti tla u zraku (GRAMON). Sadrži rezultate mjerenja radioaktivnosti u površinskom zraku na sedam lokacija: Beograd (Srbija),
Ljubljana i Krško (Slovenija), Sarajevo (Bosna i Hercegovina), Podgorica (Crna
Gora), Skopje i Bitola (Sjeverna Makedonija). Naš rad daje statističku analizu
mjesečnih (prosječnih) vrijednosti koncentracija aktivnosti radionuklida za svaku
lokaciju od 2010. do 2019. Rezultati pokazuju prostorne razlike i vremensku
evoluciju radioaktivnosti zraka u ovoj regiji koja je obično nedovoljno zastupljena
u velikim studijama., Measurements of activity concentrations of radionuclides Be-7 (beryllium-7), Pb210 (lead210), and Cs-137 (cesium-137) in the Earth’s atmosphere are essential for
understanding atmospheric processes, air quality, and environmental radioactivity.
Beryllium-7 is a radioactive isotope produced primarily by cosmic ray interactions
with nitrogen and oxygen atoms in the upper atmosphere. Its short half-life makes
it a valuable tracer for atmospheric processes on relatively short timescales. Lead210 is a radioactive isotope whose primary source in the atmosphere is decay
of radon gas. With a longer half-life than Be-7, it is suitable for studying longerterm atmospheric processes. Cesium-137, on the other hand, is an anthropogenic
radioisotope with a half-life even longer than that of Pb-210, which makes it a good
long-term environmental tracer.
The Ground Air Radioactivity Monitoring (GRAMON) database has been recently
established. It contains the outcomes of radioactivity measurements in the surface air at seven locations: Belgrade (Serbia), Ljubljana and Krško (Slovenia),
Sarajevo (Bosnia and Herzegovina), Podgorica (Montenegro), Skopje and Bitola
(North Macedonia). Our paper gives a statistical analysis of monthly (average)
values of the radionuclides’ activity concentrations for each location from 2010
to 2019. The results demonstrate spatial differences and temporal evolution of air
radioactivity over this region commonly underrepresented in large-scale studies.",
publisher = "Bilje : Javna ustanova „Park prirode Kopački rit“",
journal = "12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.",
title = "Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi, Measurements of Be-7, Pb-210 and Cs-137 activity concentrations in the surface atmosphere",
pages = "250-253",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_3271"
}

Zorko, B., Ajtić, J., Nečemer, M., Sarvan, D., Rajačić, M., Korun, M., Vodenik, B., Krneta Nikolić, J., Glavič-Cindro, D., Vukanac, I., Petrovič, T., Ilić, Z., Vidic, a., Didović, I., Janušeski, J., Anuševa, J., Dimovska, S., Danilovski, D., Anđelić, T., Zekić, R., Svrkota, N., Radonjić, S.,& Petrinec, B.. (2023). Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi. in 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.
Bilje : Javna ustanova „Park prirode Kopački rit“., 250-253.
https://hdl.handle.net/21.15107/rcub_veterinar_3271

Zorko B, Ajtić J, Nečemer M, Sarvan D, Rajačić M, Korun M, Vodenik B, Krneta Nikolić J, Glavič-Cindro D, Vukanac I, Petrovič T, Ilić Z, Vidic A, Didović I, Janušeski J, Anuševa J, Dimovska S, Danilovski D, Anđelić T, Zekić R, Svrkota N, Radonjić S, Petrinec B. Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi. in 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.. 2023;:250-253.
https://hdl.handle.net/21.15107/rcub_veterinar_3271 .

Zorko, Benjamin, Ajtić, Jelena, Nečemer, Marijan, Sarvan, Darko, Rajačić, Milica, Korun, Matjaž, Vodenik, Branko, Krneta Nikolić, Jelena, Glavič-Cindro, Denis, Vukanac, Ivana, Petrovič, Toni, Ilić, Zorana, Vidic, alf, Didović, Irma, Janušeski, Jovan, Anuševa, Jordanka, Dimovska, Snezana, Danilovski, Dejan, Anđelić, Tomislav, Zekić, Ranko, Svrkota, Nikola, Radonjić, Slavko, Petrinec, Branko, "Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi" in 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023. (2023):250-253,
https://hdl.handle.net/21.15107/rcub_veterinar_3271 .

TY  - CONF
AU  - Hernández Ceballos, Miguel Ángel
AU  - Ajtić, Jelena
AU  - Brattich, Erika
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3273
AB  - The temporal and spatial variability of atmospheric compounds and pollutants is largely driven by a combination of local, mesoscale and synoptic meteorological conditions influencing atmospheric processes, such as horizontal and vertical dispersion, deposition, chemical reactions rates and velocity. At the same time, different anthropogenic and natural radionuclides have long been used as tracers to understand and describe surface and atmospheric processes and their influence on transport and deposition. Among these substances, 7Be, a cosmogenic radionuclide produced by  spallation reactions in the stratosphere and upper troposphere, is frequently used as tracer of different atmospheric processes. Many studies have reported how the variability of 7Be surface concentration is driven by the movement of air masses, atmospheric deposition processes, tropospheric vertical mixing, and the vertical exchange between the stratosphere and the troposphere. 

With an aim to elucidate the influence of teleconnection and tropospheric circulation dynamics, several studies have investigated the influence of the main modes of large scale and regional climate variability in Europe, such as North Atlantic Oscillation (NAO), Arctic Oscillation (AO), East Atlantic (EA), East Atlantic/Western Russia (EA/WR), Scandinavian pattern (SCAND), and Western Mediterranean Oscillation (WeMO) on the surface 7Be activity concentrations. This paper, in particular, presents a summary of recent results achieved by our team working on this topic, focusing firstly at the European scale and then to northern Europe. 

Analysing 7Be surface concentrations measured at 15 European sampling stations over 2005–2014 and combining the calculation of air mass trajectories and cluster analysis with time series of teleconnection indices, we found that extremely high values of the 7Be surface concentrations are largely connected with the negative phase of NAO and We-MO, and with the positive EA phase. These results showed a latitudinal division between the northern and southern sites, with a similar influence of teleconnection patterns, while the sites located in the central part of Europe present a larger variability in the impact of teleconnection patterns. A detailed analysis in northern Europe revealed that extreme 7Be surface concentrations observed during winter were associated with variability of the Arctic polar vortex and linked with high values of the SCAND index.

The findings provide a classification of meteorological conditions associated with high surface 7Be concentrations and thus offer a basis for forecasting these events. In a general view, the findings also help in understanding the seasonal and inter-annual atmospheric variability at different scales and its impact on airborne concentrations of radionuclides and pollutants.
PB  - European Meteorological Society
C3  - European Meteorological Society, Annual Meeting, Bratislava 4–8 September, 2023
T1  - Understanding the variability of 7Be surface concentrations in Europe: the role of teleconnection patterns
VL  - 20
DO  - https://doi.org/10.5194/ems2023-204
ER  - 

@conference{
author = "Hernández Ceballos, Miguel Ángel and Ajtić, Jelena and Brattich, Erika",
year = "2023",
abstract = "The temporal and spatial variability of atmospheric compounds and pollutants is largely driven by a combination of local, mesoscale and synoptic meteorological conditions influencing atmospheric processes, such as horizontal and vertical dispersion, deposition, chemical reactions rates and velocity. At the same time, different anthropogenic and natural radionuclides have long been used as tracers to understand and describe surface and atmospheric processes and their influence on transport and deposition. Among these substances, 7Be, a cosmogenic radionuclide produced by  spallation reactions in the stratosphere and upper troposphere, is frequently used as tracer of different atmospheric processes. Many studies have reported how the variability of 7Be surface concentration is driven by the movement of air masses, atmospheric deposition processes, tropospheric vertical mixing, and the vertical exchange between the stratosphere and the troposphere. 

With an aim to elucidate the influence of teleconnection and tropospheric circulation dynamics, several studies have investigated the influence of the main modes of large scale and regional climate variability in Europe, such as North Atlantic Oscillation (NAO), Arctic Oscillation (AO), East Atlantic (EA), East Atlantic/Western Russia (EA/WR), Scandinavian pattern (SCAND), and Western Mediterranean Oscillation (WeMO) on the surface 7Be activity concentrations. This paper, in particular, presents a summary of recent results achieved by our team working on this topic, focusing firstly at the European scale and then to northern Europe. 

Analysing 7Be surface concentrations measured at 15 European sampling stations over 2005–2014 and combining the calculation of air mass trajectories and cluster analysis with time series of teleconnection indices, we found that extremely high values of the 7Be surface concentrations are largely connected with the negative phase of NAO and We-MO, and with the positive EA phase. These results showed a latitudinal division between the northern and southern sites, with a similar influence of teleconnection patterns, while the sites located in the central part of Europe present a larger variability in the impact of teleconnection patterns. A detailed analysis in northern Europe revealed that extreme 7Be surface concentrations observed during winter were associated with variability of the Arctic polar vortex and linked with high values of the SCAND index.

The findings provide a classification of meteorological conditions associated with high surface 7Be concentrations and thus offer a basis for forecasting these events. In a general view, the findings also help in understanding the seasonal and inter-annual atmospheric variability at different scales and its impact on airborne concentrations of radionuclides and pollutants.",
publisher = "European Meteorological Society",
journal = "European Meteorological Society, Annual Meeting, Bratislava 4–8 September, 2023",
title = "Understanding the variability of 7Be surface concentrations in Europe: the role of teleconnection patterns",
volume = "20",
doi = "https://doi.org/10.5194/ems2023-204"
}

Hernández Ceballos, M. Á., Ajtić, J.,& Brattich, E.. (2023). Understanding the variability of 7Be surface concentrations in Europe: the role of teleconnection patterns. in European Meteorological Society, Annual Meeting, Bratislava 4–8 September, 2023
European Meteorological Society., 20.
https://doi.org/https://doi.org/10.5194/ems2023-204

Hernández Ceballos MÁ, Ajtić J, Brattich E. Understanding the variability of 7Be surface concentrations in Europe: the role of teleconnection patterns. in European Meteorological Society, Annual Meeting, Bratislava 4–8 September, 2023. 2023;20.
doi:https://doi.org/10.5194/ems2023-204 .

Hernández Ceballos, Miguel Ángel, Ajtić, Jelena, Brattich, Erika, "Understanding the variability of 7Be surface concentrations in Europe: the role of teleconnection patterns" in European Meteorological Society, Annual Meeting, Bratislava 4–8 September, 2023, 20 (2023),
https://doi.org/https://doi.org/10.5194/ems2023-204 . .

TY  - CONF
AU  - Sarvan, Darko
AU  - Stratimirović, Đorđe
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Vukanac, Ivana
AU  - Ajtić, Jelena
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3270
AB  - U ovom istraživanju analizirana je fraktalna priroda vremenske serije specifične aktivnosti berilijuma-7 u površinskom sloju atmosfere u Beogradu, Srbija, sa ciljem da se prouči dinamika njene samosličnosti, a s posebnim fokusom na godišnji ciklus. Korišćene su metode vejvlet analize i vremenski zavisne detrendovane pokretne srednje vrednosti radi identifikacije karakterističnih intervala i procene Hurstovih eksponenata.
Podaci o specifičnoj aktivnosti berilijuma-7 preuzeti su iz GRAMON baze podataka, za lokaciju Beograd (44,88 °N; 20,58 °E; 95 m nadmorske visine). Vremenska serija obuhvata 362 mesečna merenja od 1991. do 2022. godine.
Rezultati ukazuju na postojanje izraženog godišnjeg ciklusa u ovoj vremenskoj seriji. Takođe, promene u lokalnom Hurstovom eksponentu otkrivaju varijacije u ponašanju vremenske serije – ona iz umereno korelisanog prelazi u izrazito antikorelisan proces između 2015. i 2020. godine.
Ovaj rezultat biće predmet šire analize koja uključuje i druge lokacije iz GRAMON baze podataka.
PB  - Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023
T1  - Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022)
SP  - 122
EP  - 127
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_3270
ER  - 

@conference{
author = "Sarvan, Darko and Stratimirović, Đorđe and Rajačić, Milica and Krneta Nikolić, Jelena and Vukanac, Ivana and Ajtić, Jelena",
year = "2023",
abstract = "U ovom istraživanju analizirana je fraktalna priroda vremenske serije specifične aktivnosti berilijuma-7 u površinskom sloju atmosfere u Beogradu, Srbija, sa ciljem da se prouči dinamika njene samosličnosti, a s posebnim fokusom na godišnji ciklus. Korišćene su metode vejvlet analize i vremenski zavisne detrendovane pokretne srednje vrednosti radi identifikacije karakterističnih intervala i procene Hurstovih eksponenata.
Podaci o specifičnoj aktivnosti berilijuma-7 preuzeti su iz GRAMON baze podataka, za lokaciju Beograd (44,88 °N; 20,58 °E; 95 m nadmorske visine). Vremenska serija obuhvata 362 mesečna merenja od 1991. do 2022. godine.
Rezultati ukazuju na postojanje izraženog godišnjeg ciklusa u ovoj vremenskoj seriji. Takođe, promene u lokalnom Hurstovom eksponentu otkrivaju varijacije u ponašanju vremenske serije – ona iz umereno korelisanog prelazi u izrazito antikorelisan proces između 2015. i 2020. godine.
Ovaj rezultat biće predmet šire analize koja uključuje i druge lokacije iz GRAMON baze podataka.",
publisher = "Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023",
title = "Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022)",
pages = "122-127",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_3270"
}

Sarvan, D., Stratimirović, Đ., Rajačić, M., Krneta Nikolić, J., Vukanac, I.,& Ajtić, J.. (2023). Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022). in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023
Institut za nuklearne nauke "Vinča"., 122-127.
https://hdl.handle.net/21.15107/rcub_veterinar_3270

Sarvan D, Stratimirović Đ, Rajačić M, Krneta Nikolić J, Vukanac I, Ajtić J. Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022). in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023. 2023;:122-127.
https://hdl.handle.net/21.15107/rcub_veterinar_3270 .

Sarvan, Darko, Stratimirović, Đorđe, Rajačić, Milica, Krneta Nikolić, Jelena, Vukanac, Ivana, Ajtić, Jelena, "Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022)" in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023 (2023):122-127,
https://hdl.handle.net/21.15107/rcub_veterinar_3270 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Vukanac, Ivana
AU  - Ilić, Zorana
AU  - Vidic, Alfred
AU  - Didović, Irma
AU  - Janushesk, Jovan
AU  - Anusheva, Jordanka
AU  - Dimovska, Snežana
AU  - Danilovski, Dejan
AU  - Anđelić, Tomislav
AU  - Zekić, Ranko
AU  - Svrkota, Nikola
AU  - Radonjić, Slavko
AU  - Vodenik, Branko
AU  - Zorko, Benjamin
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3269
AB  - U radu je predstavljena novoformirana baza podataka GRAMON (Ground Air Radioactivity Monitoring) koja sadrži rezultate merenja radioaktivnosti u vazduhu na sedam lokacija: Beograd (Srbija), Ljubljana i Krško (Slovenija), Sarajevo (Bosna i Hercegovina), Podgorica (Crna Gora), Skoplje i Bitola (Severna Makedonija). Iz baze su za sve lokacije preuzete mesečne vrednosti specifične aktivnosti prirodnog radionuklida berilijuma-7 i potom analizirani deskriptivni statistički parametri od januara 2010. do decembra 2019. godine.
Srednje vrednosti specifične aktivnosti berilijuma-7 tokom ovog perioda kreću se od 3,32 mBq/m3 u Sarajevu do 5,93 mBq/m3 u Beogradu. Koeficijent varijacije najmanji je za Krško (37,7%) i Sarajevo (38,6%), a najveći za Beograd (54,8%) i Bitolu (72,4%). Ipak, 3σ-opsezi svih sedam vremenskih serija se preklapaju. U daljoj statističkoj analizi biće ispitano da li među ovim vremenskim serijama postoje značajne razlike.
PB  - Institut za nuklearne nauke „Vinča“
PB  - Društvo za zaštitu od zračenja Srbije i Srne Gore
C3  - XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023
T1  - GRAMON baza podataka: Desetogodišnja merenja specifične aktivnosti berilijuma-7 u vazduhu
SP  - 30
EP  - 35
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_3269
ER  - 

@conference{
author = "Ajtić, Jelena and Rajačić, Milica and Krneta Nikolić, Jelena and Vukanac, Ivana and Ilić, Zorana and Vidic, Alfred and Didović, Irma and Janushesk, Jovan and Anusheva, Jordanka and Dimovska, Snežana and Danilovski, Dejan and Anđelić, Tomislav and Zekić, Ranko and Svrkota, Nikola and Radonjić, Slavko and Vodenik, Branko and Zorko, Benjamin",
year = "2023",
abstract = "U radu je predstavljena novoformirana baza podataka GRAMON (Ground Air Radioactivity Monitoring) koja sadrži rezultate merenja radioaktivnosti u vazduhu na sedam lokacija: Beograd (Srbija), Ljubljana i Krško (Slovenija), Sarajevo (Bosna i Hercegovina), Podgorica (Crna Gora), Skoplje i Bitola (Severna Makedonija). Iz baze su za sve lokacije preuzete mesečne vrednosti specifične aktivnosti prirodnog radionuklida berilijuma-7 i potom analizirani deskriptivni statistički parametri od januara 2010. do decembra 2019. godine.
Srednje vrednosti specifične aktivnosti berilijuma-7 tokom ovog perioda kreću se od 3,32 mBq/m3 u Sarajevu do 5,93 mBq/m3 u Beogradu. Koeficijent varijacije najmanji je za Krško (37,7%) i Sarajevo (38,6%), a najveći za Beograd (54,8%) i Bitolu (72,4%). Ipak, 3σ-opsezi svih sedam vremenskih serija se preklapaju. U daljoj statističkoj analizi biće ispitano da li među ovim vremenskim serijama postoje značajne razlike.",
publisher = "Institut za nuklearne nauke „Vinča“, Društvo za zaštitu od zračenja Srbije i Srne Gore",
journal = "XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023",
title = "GRAMON baza podataka: Desetogodišnja merenja specifične aktivnosti berilijuma-7 u vazduhu",
pages = "30-35",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_3269"
}

Ajtić, J., Rajačić, M., Krneta Nikolić, J., Vukanac, I., Ilić, Z., Vidic, A., Didović, I., Janushesk, J., Anusheva, J., Dimovska, S., Danilovski, D., Anđelić, T., Zekić, R., Svrkota, N., Radonjić, S., Vodenik, B.,& Zorko, B.. (2023). GRAMON baza podataka: Desetogodišnja merenja specifične aktivnosti berilijuma-7 u vazduhu. in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023
Institut za nuklearne nauke „Vinča“., 30-35.
https://hdl.handle.net/21.15107/rcub_veterinar_3269

Ajtić J, Rajačić M, Krneta Nikolić J, Vukanac I, Ilić Z, Vidic A, Didović I, Janushesk J, Anusheva J, Dimovska S, Danilovski D, Anđelić T, Zekić R, Svrkota N, Radonjić S, Vodenik B, Zorko B. GRAMON baza podataka: Desetogodišnja merenja specifične aktivnosti berilijuma-7 u vazduhu. in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023. 2023;:30-35.
https://hdl.handle.net/21.15107/rcub_veterinar_3269 .

Ajtić, Jelena, Rajačić, Milica, Krneta Nikolić, Jelena, Vukanac, Ivana, Ilić, Zorana, Vidic, Alfred, Didović, Irma, Janushesk, Jovan, Anusheva, Jordanka, Dimovska, Snežana, Danilovski, Dejan, Anđelić, Tomislav, Zekić, Ranko, Svrkota, Nikola, Radonjić, Slavko, Vodenik, Branko, Zorko, Benjamin, "GRAMON baza podataka: Desetogodišnja merenja specifične aktivnosti berilijuma-7 u vazduhu" in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023 (2023):30-35,
https://hdl.handle.net/21.15107/rcub_veterinar_3269 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Vukanac, Ivana
AU  - Ilić, Zorana
AU  - Vidic, Alfred
AU  - Didović, Irma
AU  - Janušeski, Jovan
AU  - Anusheva, Jordanka
AU  - Dimovska, Snezana
AU  - Danilovski, Dejan
AU  - Anđelić, Tomislav
AU  - Zekić, Ranko
AU  - Svrkota, Nikola
AU  - Radonjić, Slavko
AU  - Vodenik, Branko
AU  - Zorko, Benjamin
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3003
AB  - Ground Air Radioactivity Monitoring (GRAMON) database is a recently established collection containing activity concentrations of gamma emitters in aerosol samples. The measurements come
from Serbia (sampling site Belgrade), Slovenia (sampling sites Ljubljana and Krško), Bosnia and
Herzegovina (sampling site Sarajevo), Montenegro (sampling site Podgorica), and North Macedonia (sampling sites Skopje and Bitola), thus covering the northern and central parts of the Balkan Peninsula.
As a database arising from the monitoring programmes in several countries, GRAMON is not
fully homogeneous in terms of the radionuclides and time periods studied. For example, the
beryllium-7 records are available for all sampling sites, while the lead-210 records only in Serbia,
Slovenia, and Bosnia and Herzegovina. The time series for Serbia and Slovenia began in 1991, for
Montenegro and North Macedonia in 2008, and for Bosnia and Herzegovina in 2010.
However, sampling, sample preparation, and measurement procedures across the sites and
laboratories are similar. In brief, aerosol samples are collected on filter papers using air samplers.
Activity concentrations of radionuclides are determined by standard gamma spectrometry using
high-purity germanium detectors. The time series contain monthly mean activity concentrations.
Since only some of the GRAMON records have been previously published, this database provides
a source for radioactivity research in the region that has been underrepresented in large-scale
studies. We further hope to expand the number of contributing laboratories and cover a wider region of Europe, especially its southern and eastern parts.
PB  - Niš : Sievert Association
C3  - International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023
T1  - Introducing a regional database of radioactivity in the air – GRAMON
SP  - 91
EP  - 91
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_3003
ER  - 

@conference{
author = "Ajtić, Jelena and Sarvan, Darko and Rajačić, Milica and Krneta Nikolić, Jelena and Vukanac, Ivana and Ilić, Zorana and Vidic, Alfred and Didović, Irma and Janušeski, Jovan and Anusheva, Jordanka and Dimovska, Snezana and Danilovski, Dejan and Anđelić, Tomislav and Zekić, Ranko and Svrkota, Nikola and Radonjić, Slavko and Vodenik, Branko and Zorko, Benjamin",
year = "2023",
abstract = "Ground Air Radioactivity Monitoring (GRAMON) database is a recently established collection containing activity concentrations of gamma emitters in aerosol samples. The measurements come
from Serbia (sampling site Belgrade), Slovenia (sampling sites Ljubljana and Krško), Bosnia and
Herzegovina (sampling site Sarajevo), Montenegro (sampling site Podgorica), and North Macedonia (sampling sites Skopje and Bitola), thus covering the northern and central parts of the Balkan Peninsula.
As a database arising from the monitoring programmes in several countries, GRAMON is not
fully homogeneous in terms of the radionuclides and time periods studied. For example, the
beryllium-7 records are available for all sampling sites, while the lead-210 records only in Serbia,
Slovenia, and Bosnia and Herzegovina. The time series for Serbia and Slovenia began in 1991, for
Montenegro and North Macedonia in 2008, and for Bosnia and Herzegovina in 2010.
However, sampling, sample preparation, and measurement procedures across the sites and
laboratories are similar. In brief, aerosol samples are collected on filter papers using air samplers.
Activity concentrations of radionuclides are determined by standard gamma spectrometry using
high-purity germanium detectors. The time series contain monthly mean activity concentrations.
Since only some of the GRAMON records have been previously published, this database provides
a source for radioactivity research in the region that has been underrepresented in large-scale
studies. We further hope to expand the number of contributing laboratories and cover a wider region of Europe, especially its southern and eastern parts.",
publisher = "Niš : Sievert Association",
journal = "International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023",
title = "Introducing a regional database of radioactivity in the air – GRAMON",
pages = "91-91",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_3003"
}

Ajtić, J., Sarvan, D., Rajačić, M., Krneta Nikolić, J., Vukanac, I., Ilić, Z., Vidic, A., Didović, I., Janušeski, J., Anusheva, J., Dimovska, S., Danilovski, D., Anđelić, T., Zekić, R., Svrkota, N., Radonjić, S., Vodenik, B.,& Zorko, B.. (2023). Introducing a regional database of radioactivity in the air – GRAMON. in International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023
Niš : Sievert Association., 91-91.
https://hdl.handle.net/21.15107/rcub_veterinar_3003

Ajtić J, Sarvan D, Rajačić M, Krneta Nikolić J, Vukanac I, Ilić Z, Vidic A, Didović I, Janušeski J, Anusheva J, Dimovska S, Danilovski D, Anđelić T, Zekić R, Svrkota N, Radonjić S, Vodenik B, Zorko B. Introducing a regional database of radioactivity in the air – GRAMON. in International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023. 2023;:91-91.
https://hdl.handle.net/21.15107/rcub_veterinar_3003 .

Ajtić, Jelena, Sarvan, Darko, Rajačić, Milica, Krneta Nikolić, Jelena, Vukanac, Ivana, Ilić, Zorana, Vidic, Alfred, Didović, Irma, Janušeski, Jovan, Anusheva, Jordanka, Dimovska, Snezana, Danilovski, Dejan, Anđelić, Tomislav, Zekić, Ranko, Svrkota, Nikola, Radonjić, Slavko, Vodenik, Branko, Zorko, Benjamin, "Introducing a regional database of radioactivity in the air – GRAMON" in International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023 (2023):91-91,
https://hdl.handle.net/21.15107/rcub_veterinar_3003 .

TY  - CONF
AU  - Raković, Ana
AU  - Krčmar, Maja
AU  - Ajtić, Jelena
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2694
AB  - Activity concentration of beryllium-7 (Be-7) in the surface air is considered a good tracer of atmospheric processes. Promptly after its production, this radionuclide attaches to aerosols and then subsides to the surface where its concentrations depend on the aerosol removal processes, e.g. precipitation, and atmospheric transport drivers, e.g. temperature and pressure. Our study investigates whether a set of five variables: mean temperature, minimum temperature, maximum temperature, precipitation and atmospheric pressure can account for the Be-7 concentration variability at the surface.
We use the Be-7 activity concentration from the Radioactivity Environmental Monitoring data bank
maintained by the Joint Research Centre in Ispra, Italy. We look into two locations, Kista (59.40 °N; 17.93 °E; 16 m a.s.l.) in Sweden and Vienna (48.22 °N; 16.35 °E; 193 m a.s.l.) in Austria, between February 1987 and December 2014, when the sampling was performed on a weekly basis. The meteorological parameters are extracted from the E-OBS gridded climatology, version 15, using bilinear interpolation.
For each location, we perform Factor Analysis. The calculations are done in R, an open-source software for statistical computing and graphics.
Factor Analysis assumes that a given set can be modelled as a linear combination of unobserved
uncorrelated factors. Loadings are contributions of each original variable to a factor; variables with high loadings are well explained by the factor. The total data variability has two terms: communality arising from the linear combinations of the factors, and uniqueness not explained by the factors. The model is appropriate if the uniqueness is low. The null hypothesis in Factor Analysis is that the chosen number of factors is sufficient to explain the variability of the data; the hypothesis is rejected if the calculated p-value is less than 0.05.
We perform Factor Analysis by choosing 1, 2 and 3 factors. Results for both locations give similar results.
One factor (F1): Temperatures show very high loadings (greater than 0.98) making F1 identical to a temperature variable in the set. The loading of the Be-7 concentration is 0.39 and 0.68 for Kista and Vienna, respectively. The loadings of precipitation and atmospheric pressure are less than 0.4. With the low Be-7 concentration loading, its uniqueness is large, giving temperature, as a single contributing factor, insufficient to explain well the data’s features. This is corroborated by the p-value=0.
Two factors (F1 and F2): The sum of square loadings for F1 is greater than 3 making it significant, unlike F2 (a factor is significant if the sum of square loadings is greater than 1). The Be-7 concentration and temperatures have high loadings for F1, but precipitation has a negligible F1-loading; precipitation has a significant loading for F2, while the pressure has similar loadings for F1 and F2. Although the uniqueness of the Be-7 concentration decreases with two factors, p-value is again very low, essentially zero.
Three factors (F1, F2 and F3): Again, F1 with the highest temperature loadings can be identified as a temperature variable. The loading of atmospheric pressure is the highest for F2. Both F1 and F2 are significant, while F3 is insignificant. Also, we cannot assess the validity of the null hypothesis regarding the use of the 3-factor model, because this model has zero degrees of freedom, thus no p-value can be calculated. Nevertheless, if we look into the uniqueness of the Be-7 concentration, its lowest values are given by this model.
In conclusion, all variables exhibit a variance that cannot be captured by up to 3 factors. Still, the Be-7 concentration seems to be strongly correlated with the temperature variables in all the investigated models. But, the uniqueness of the Be-7 concentration remains high, implying that the chosen set of variables lacks an important observable that could help explain the behaviour of the Be-7 concentration at the surface.
PB  - Faculty of Electronic Engineering, Niš, Serbia
C3  - ELICSIR Project Symposium, , Niš, January 25-27, 2023
T1  - The uniqueness of the beryllium-7 time series in Kista and Vienna over 1987–2014
SP  - 29
EP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2694
ER  - 

@conference{
author = "Raković, Ana and Krčmar, Maja and Ajtić, Jelena",
year = "2023",
abstract = "Activity concentration of beryllium-7 (Be-7) in the surface air is considered a good tracer of atmospheric processes. Promptly after its production, this radionuclide attaches to aerosols and then subsides to the surface where its concentrations depend on the aerosol removal processes, e.g. precipitation, and atmospheric transport drivers, e.g. temperature and pressure. Our study investigates whether a set of five variables: mean temperature, minimum temperature, maximum temperature, precipitation and atmospheric pressure can account for the Be-7 concentration variability at the surface.
We use the Be-7 activity concentration from the Radioactivity Environmental Monitoring data bank
maintained by the Joint Research Centre in Ispra, Italy. We look into two locations, Kista (59.40 °N; 17.93 °E; 16 m a.s.l.) in Sweden and Vienna (48.22 °N; 16.35 °E; 193 m a.s.l.) in Austria, between February 1987 and December 2014, when the sampling was performed on a weekly basis. The meteorological parameters are extracted from the E-OBS gridded climatology, version 15, using bilinear interpolation.
For each location, we perform Factor Analysis. The calculations are done in R, an open-source software for statistical computing and graphics.
Factor Analysis assumes that a given set can be modelled as a linear combination of unobserved
uncorrelated factors. Loadings are contributions of each original variable to a factor; variables with high loadings are well explained by the factor. The total data variability has two terms: communality arising from the linear combinations of the factors, and uniqueness not explained by the factors. The model is appropriate if the uniqueness is low. The null hypothesis in Factor Analysis is that the chosen number of factors is sufficient to explain the variability of the data; the hypothesis is rejected if the calculated p-value is less than 0.05.
We perform Factor Analysis by choosing 1, 2 and 3 factors. Results for both locations give similar results.
One factor (F1): Temperatures show very high loadings (greater than 0.98) making F1 identical to a temperature variable in the set. The loading of the Be-7 concentration is 0.39 and 0.68 for Kista and Vienna, respectively. The loadings of precipitation and atmospheric pressure are less than 0.4. With the low Be-7 concentration loading, its uniqueness is large, giving temperature, as a single contributing factor, insufficient to explain well the data’s features. This is corroborated by the p-value=0.
Two factors (F1 and F2): The sum of square loadings for F1 is greater than 3 making it significant, unlike F2 (a factor is significant if the sum of square loadings is greater than 1). The Be-7 concentration and temperatures have high loadings for F1, but precipitation has a negligible F1-loading; precipitation has a significant loading for F2, while the pressure has similar loadings for F1 and F2. Although the uniqueness of the Be-7 concentration decreases with two factors, p-value is again very low, essentially zero.
Three factors (F1, F2 and F3): Again, F1 with the highest temperature loadings can be identified as a temperature variable. The loading of atmospheric pressure is the highest for F2. Both F1 and F2 are significant, while F3 is insignificant. Also, we cannot assess the validity of the null hypothesis regarding the use of the 3-factor model, because this model has zero degrees of freedom, thus no p-value can be calculated. Nevertheless, if we look into the uniqueness of the Be-7 concentration, its lowest values are given by this model.
In conclusion, all variables exhibit a variance that cannot be captured by up to 3 factors. Still, the Be-7 concentration seems to be strongly correlated with the temperature variables in all the investigated models. But, the uniqueness of the Be-7 concentration remains high, implying that the chosen set of variables lacks an important observable that could help explain the behaviour of the Be-7 concentration at the surface.",
publisher = "Faculty of Electronic Engineering, Niš, Serbia",
journal = "ELICSIR Project Symposium, , Niš, January 25-27, 2023",
title = "The uniqueness of the beryllium-7 time series in Kista and Vienna over 1987–2014",
pages = "29-29",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2694"
}

Raković, A., Krčmar, M.,& Ajtić, J.. (2023). The uniqueness of the beryllium-7 time series in Kista and Vienna over 1987–2014. in ELICSIR Project Symposium, , Niš, January 25-27, 2023
Faculty of Electronic Engineering, Niš, Serbia., 29-29.
https://hdl.handle.net/21.15107/rcub_veterinar_2694

Raković A, Krčmar M, Ajtić J. The uniqueness of the beryllium-7 time series in Kista and Vienna over 1987–2014. in ELICSIR Project Symposium, , Niš, January 25-27, 2023. 2023;:29-29.
https://hdl.handle.net/21.15107/rcub_veterinar_2694 .

Raković, Ana, Krčmar, Maja, Ajtić, Jelena, "The uniqueness of the beryllium-7 time series in Kista and Vienna over 1987–2014" in ELICSIR Project Symposium, , Niš, January 25-27, 2023 (2023):29-29,
https://hdl.handle.net/21.15107/rcub_veterinar_2694 .