6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedoni

Ajtić, Jelena

Glavič Cindro, Denis

Kožar Logar, Jasmina

Krneta-Nikolić, Jelena D.

Rajačić, Milica

Sarvan, Darko

Todorović, Dragana

Vodenik, Branko

Zorko, Benjamin

Đurđević, Vladimir

English

VI International Conference on Radiation in Various Fields of Research : RAD 2018 : book of abstracts; June 18-22, 2018; Ohrid, Macedoni

Repository of the Vinča Nuclear Institute (VinaR)

rad-conference.org1 . 06. - . 06. 201  Metropol Lake Resort  Ohrid  Macedonia8    22   8 | |  |SIXTH INTERNATIONAL CONFERENCE ON RADIATION AND APPLICATIONS IN VARIOUS FIELDS OF RESEARCHSilver sponsor 185   BEHAVIOUR OF BERYLLIUM-7 AND LEAD-210 TIME SERIES MEASURED  IN SERBIA AND SLOVENIA OVER 1991-2015  Darko Sarvan1, Dragana Todorović2, Milica Rajačić2,  Jelena Krneta Nikolić2, Vladimir Djurdjevic3, Benjamin Zorko4, Branko Vodenik4, Denis Glavič Cindro4,  Jasmina Kožar Logar4, Jelena Ajtić1 1 University of Belgrade, Faculty of Veterinary Medicine, Belgrade, Serbia 2 University of Belgrade, Vinča Institute of Nuclear Sciences, Belgrade, Serbia 3 University of Belgrade, Faculty of Physics, Belgrade, Serbia 4 Jožef Stefan Institute, Ljubljana, Slovenia  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: RAD Association Bulevar Nikole Tesle 17/12, 18000 Niš, Serbia www.rad-association.org FOR THE PUBLISHER: Prof. Dr Goran Ristić YEAR OF PUBLISHING: 2018 EDITOR: Prof. Dr Goran Ristić COVER DESIGN: Vladan Nikolić, PhD TECHNICAL EDITING: Vladan Nikolić, PhD and Sasa Trenčić, MA PROOF-READING: Saša Trenčić, MA CD BURNING AND COPYING: RAD Association, Niš, Serbia PRINT RUN: Electronic edition – 350 CDs (CD-R) ISBN: 978-86-80300-03-0 The Sixth International Conference on Radiation and Applications in Various Fields of Research (RAD 2018) was financially supported by the Central European Initiative (CEI).  CIP - Каталогизација у публикацији Народна библиотека Србије, Београд 539.16(048)(0.034.2) INTERNATIONAL Conference on Radiation and Applications in Various Fields of Research (6 ; 2018 ; Ohrid) Book of Abstracts [Elektronski izvor] / Sixth International Conference on Radiation and Applications in Various Fields of Research, RAD 2018, 18.06 - 22.06. 2018, Ohrid, Macedonia ; [editor Goran Ristić]. - Niš : RAD Association, 2018 (Niš : RAD Association). - 1 elektronski optički disk (CD-ROM) ; 12 cm Sistemski zahtevi: Nisu navedeni. - Na nasl. str.: CEI Central European Initiative. - Nasl. sa naslovne strane dokumenta. - Tiraž 350. ISBN 978-86-80300-03-0 a) Јонизујуће зрачење - Дозиметрија - Апстракти COBISS.SR-ID 266468620 rad-conference.org1 . 06. - . 06. 201  Metropol Lake Resort  Ohrid  Macedonia8    22   8 | |  |SIXTH INTERNATIONAL CONFERENCE ON RADIATION AND APPLICATIONS IN VARIOUS FIELDS OF RESEARCHSilver sponsor

Behaviour of beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015

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

Krneta Nikolić, Jelena

Djurdjević, Vladimir

Veterinar - Repository of the Faculty of Veterinary Medicine

Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015

https://vet-erinar.vet.bg.ac.rs/bitstream/123456789/2346/1/bitstream_6489.pdf

Behaviour of beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015

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