Activity density of beryllium-7 in atmospheric deposit and in ground level air at five monitoring stations (MS Nis, Vranje, Zajecar, Zlatibor, Palic) in Serbia were determined during the period January-December 2014. Activity of cosmogenic radionuclide beryllium-7 was determined on HPG detectors (Canberra, relative efficienty 20%.) by gama spectrometry method. Activity density of beryllium-7 in aerosols were in range 0.5 - 9.8 mBq/m(3) and in deposits were in range 1.8 - 233 Bg/m(2). Based on the obtained results correlation coefficient between aerosols and deposits was calculated and its value ranged from 0.15 to 0.59.3rd International Conference on Radiation and Applications in Various Fields of Research (RAD), Jun 08-12, 2015, Budva, Montenegr

Janković, Marija M.

Krneta-Nikolić, Jelena D.

Pantelić, Gordana K.

Rajačić, Milica

Sarap, Nataša

Todorović, Dragana

English

Repository of the Vinča Nuclear Institute (VinaR)

PUBLISHER: RAD Association, Niš, Serbia www.rad-association.org  FOR THE PUBLISHER: Prof. Dr. Goran Ristić  EDITOR: Prof. Dr. Goran Ristić  COVER DESIGN: Vladan Nikolić, M.Sc.   TECHNICAL EDITING: Sasa Trenčić and Vladan Nikolić  PROOF-READING: Saša Trenčić, MA and Mila Aleksov, BA   ISBN: 978-86-80300-01-6     CIP - Каталогизација у публикацији -  Народна библиотека Србије, Београд    539.16(082)(0.034.2)    INTERNATIONAL Conference on Radiation and Applications in Various Fields  of Research (3rd ; 2015 ; Budva) Proceedings [Elektronski izvor] / Third International Conference on  Radiation and Applications in Various Fields of Research, RAD 2015, June  8-12, 2015, Budva, Montenegro ; [editor Goran Ristić]. - Niš : RAD  Association, 2015 (Niš : RAD Association). - 1 elektronski optički disk  (CD-ROM) ; 12 cm    Sistemski zahtevi: Nisu navedeni. - Nasl. sa naslovne strane dokumenta. -  Tiraž 400. - Bibliografija uz svaki rad.    ISBN 978-86-80300-01-6    a) Јонизујуће зрачење - Дозиметрија - Зборници  COBISS.SR-ID 215655436 Milica AbsNis, cosmspecrangand  Key 1. Beproduinteraand otroposrate iswith aincreaberylldiameatmosnaturaessentthe st[5]. Pa7 has enviroand ptimes velociconcerainwIn wefrom tresideproceswhen troposearth’betwewhichand grCORRM. RajačićUniverstract. ActivityVranje, Zajecaogenic radiontrometry methe 1.8 - 233 Bq/its value range words: beryllINTRODUCTIryllium-7 is aced by sctions of galxygen in the phere (~30% high in the utmospheric dse with altitium-7 is promter of 0.3-0.6phere is aroul radionuclial, because udy of atmosrticle reactivbeen used as nmental prorecipitation [6in the tropoties [10-13] anntration of ater is affectet deposit, prehe upper tropnt time of bs usually occair transporphere is easis surface. Ten 7Be activity means dust found level airELATION BAND GRO , Draganaity of Belgrad density of berr, Zlatibor, Pauclide berylliuod. Activity denm2. Based on td from 0.15 to 0ium-7, gammaON  naturally occpallation ractic cosmic stratosphere ) [1,2]. Produpper tropospepth and its cude [3]. Folptly attache µm whose rend 20 days [4ide concentthis informapheric circulae radionuclideatmospheric cesses such a,7], aerosol trsphere [8,9], d the fate of beryllium-7 d by both drycipitation tranosphere to theryllium-7 is urs in the spt from the sly induced byhis paper p density in atallout by dry. ETWEEN BUND LEVE J. TodorovSarap, e, Vinča InstitDepartmyllium-7 in atmlic) in Serbia wm-7 was detersity of berylliuhe obtained re.59.  spectrometry, urring radioneactions thrays with nit(~70%) and ction of beryllhere and deconcentrationlowing produd to aerosolssidence time ]. The knowleration in ation contribution of air m such as berytracers for stus cloud scaveansit and resiaerosol depopollutants [14in surface and wet procsports berylle ground whe10 days [15]ring and sumtratosphere t the heating resents corremospheric de and wet procERYLLIUML AIR IN SEić, MarijaGordana Kute of Nucleaent, 11001 Belospheric depoere determinmined on HPGm-7 in aerososults correlatiodeposit, grounduclide rough rogen upper ium-7 reases  in air ction,  with in the dge of ir is tes to asses llium-dying nging dence sition ]. The  and esses.  ium-7 re the . This mer, o the of the lation posit, esses, -7 IN ATMORBIA FOR  M. Jankov. Pantelić r Sciences, Ragrade, Serbiasit and in groued during the p detectors (Cals were in rangn coefficient be level air, corr 2. EXPActivitielevel air weradioactivity(Nis, VranjRadiation Laboratory,coordinateslocations arTable 1 GLocationNis Vranje ZajecarZlatiborPalic  Samplesdeposit collon a monthlfilter papersrelative effconstant flobelow 400°formed.  The actidetectors (SPHERIC D2014 YEARić, Jelena Ddiation and E nd level air at eriod Januarynberra, relatie 0.5 - 9.8 mBtween aerosolselation coefficieERIMENTALs of berylliumre monitored monitoring e, Zlatibor, Zand En Vinča Institut and altitudee given in the PS coordinasamplin N 43°20' 42°32'  43°56'  43°44' 46°06'  of deposit wector (0.1 or 0y basis. Samp (technical chiciency for w rate samplC and a montvities of 7Be wCanberra, wiEPOSIT   . Nikolić, nvironmental five monitorin-December 20ve efficienty 2q/m3 and in de and deposits nt   -7 in deposi in 2014 yeaat 5 locatioajecar and vironmental e of Nuclear s of each of Table 1.  tes and altitug stations E 21°54' 21°54' 22°18' 19°43' 19°46' ere obtained .2 m2) and wles of air weraracteristics deposited ders, ashed at hly compositere determinth 18%, 20Nataša B.  Protection g stations (MS14. Activity of0%.) by gamaposits were inwas calculatedt and groundr, as part ofns in SerbiaPalic) by theProtectionSciences. GPSthe samplingdes of the Altitude (m) 201 432 144 1028 102 using an areaere collectede collected onWhatman 41,ust80%) bytemperaturese sample wased on HPGe% and 50%                       324 relative efficiency) by standard gamma spectrometry. On the obtained results statistical methods were applied and Pearson's correlation coefficient between 7Be activity in aerosol and deposit was determined 3. RESULTS Figure 1 and 2 present changes of 7Be activity density in deposits and aerosols, respectively, at five different locations in Serbia for 2014. Minimum and maximum activity density of 7Be in these samples, as well as Pearson's correlation coefficient between 7Be activity in aerosol and deposit are given in table 2. Activities of both deposit and air were present on mid-point of the sampling interval, ie. middle of the month.       Activity density of 7Be in deposits ranged from 1.8 Bq/m2 (Palic, March) – 233 Bq/m2 (Zajecar, July), and exhibited a maximum in spring/summer. Activity density of 7Be in aerosols were in range from 0.3×10-3 Bq/m3 (Nis, February) – 9.8×10-3 Bq/m3 (Palic, August), and also exhibited a maximum in spring/summer. The highest 7Be activity concentrations during the warm season in the region of investigation were attributed to more efficient vertical transport of air masses in the warm season. A phenomenon that advocates to the high observed values during summer is the elevation of the tropopause during the warm summer months for midlatitudes.   1 2 3 4 5 6 7 8 9 10 11 120204060100200300501001502005101520204060801001 2 3 4 5 6 7 8 9 10 11 12 (a)(e)Month     (b)(c)(d)Activity concentrations of 7Be (Bq/m2 )  Fig. 1 Activity concentration of 7Be in deposits at locations: (a) - Vranje, (b) - Palic, (c) - Zlatibor, (d) - Zajecar, (e) - Nis 1 2 3 4 5 6 7 8 9 10 11 120,00000,00050,00100,0000,0050,0000,0050,0000,0050,0100,0000,0020,0041 2 3 4 5 6 7 8 9 10 11 12  (d)(e) (a)MonthActivity concentrations of 7Be (Bq/m3 ) (b)(c)   Fig. 2 Activity concentration of 7Be in aerosols at locations: (a) - Vranje, (b) - Palic, (c) - Zlatibor, (d) - Zajecar, (e) – Nis  Table 2 The range of 7Be activities in aerosols and deposits, as well as Pearson's correlation coefficient between 7Be activity in aerosols and deposits Location 7Be in aerosols 10-3 Bq/m3 7Be in deposits Bq/m2 Pearson's correlation coefficient (r) Nis (0.3-1.2) (2,9-52) 0.42 Vranje (1.5-3.9) (2.4-49) 0.15 Zajecar (2.3-7.5) (6,6-233) 0.33 Zlatibor (3.4-8.2) (4.1-150) 0.59 Palic (3.4-9.8) (1.8-15) 0.07   As can be seen from table 2, there are no correlation for samples collected in Palic. On the other hand in Zajecar and Vranje correlation is weak, whereas in Nis is moderate. The highest value was obtained for Best on Zlatibor and this is strong correlation.      We can assume that the causes of the relatively poor correlation are differences in the impact of geographical and meteorological characteristics of the movement of beryllium-7 in aerosol and deposits, and because of the different characteristics of each sampling level. Also, presented results are influenced by the insufficient number of samples, so we will continue to monitoring these changes, compared them, and to examine the impact of  325different geographical and meteorological characteristics of individual sampling places.  CONCLUSION The knowledge of natural radionuclide concentration in air is essential, because this information contributes to the study of atmospheric circulation of air masses. In this paper, changes of activity density of cosmogenic 7Be in atmospheric deposit and ground level air at different locations in Serbia were investigated. The obtained results are used to do a linear correlation between 7Be activity in aerosol and deposit.  The typical pattern of seasonal variations was observed for 7Be. The obtained values of 7Be activity density show a fluctuation which has oscillatory characteristics with enhanced activity in spring-summer months. This fluctuation likely relates to the seasonal thinning of tropopause, which facilitates and enhances the stratosphere – troposphere vertical air mass mixing.  Acknowledgement: The paper is a part of the research done within the project III43009 supported by the Ministry of Education and Science of the Republic of Serbia. REFERENCES   1. Y. Narazaki, Fujitaka, S. Igarashi, Y. Ishikawa and N. Fujinami “Seasonal variation of 7Be deposition in Japan”, Journal of Radioanalytical and Nuclear Chemistry, 256(3), 2003, pp 489-496. 2. M. Yoshimori,”Beryllium 7 radionuclide as a tracer of vertical air mass transport in the troposphere”, Advances in Space Research, 36,2005, pp 828-832. 3. M. M. Janković, D. J. Todorović, J. D. Nikolić, M. M. Rajačić, G. K. Pantelić and N. B. Sarap, “Temporal changes of beryllium-7 and lead-210 in ground level air in Serbia”, Hemijska industrija, 68 (1), 2014, pp 83-88. 4. J. S. Gaffney, N. A. Marley and M. M. Cunningham, "Natural radionuclides in fine aerosols in the Pittsburgh Area", Atmos. Environ., 38, 2004, pp 3191-3200 5. E. Gomez, F. Garcias, M. Casas and V. Cerda, “Determination of natural gamma emitters in surfaces air”, J. Environ. Anal. Chem., 56, 1994, pp 327-335. 6. D. M. Koch, D. J. Jacob and W. C. Graustein, “Vertical transport of tropospheric aerosols as indicated by 7Be and 210Pb in a chemical tracer model”, J. Geophys. Res., 101, 1996, pp 18651–18666. 7. H. Liu, D. Jacob, I. Bey and R. Yantosca, “Constraints from 210Pb and 7Be on wet deposition and transport in a global three-dimentional chemical tracer model driven by assimilated meteorological fields”, J. Geophys. Res., 106, 2001, pp 12109–12128. 8. C. Papastefanou, A. Ioannidou, S. Stoulos and M. Manolopoulou, “Atmospheric deposition of cosmogenic 7Be and 137Cs from fallout of the Chernobyl accident”, The Science of the Total Environment, 170, 1995, pp 151-156. 9. R. Winkler, F. Dietl, G. Frank and J. Tschiersch, “Temporal variations of 7Be and 210Pb size distributions in ambient aerosol”, Atmos. Environ. 32, 1998, pp 983–991. 10. J. A. Young and W. B. Silker, “Aerosol deposition velocities on the Pacific and Atlantic Oceans calculated from 7Be measurements”, Earth. Planet. Sci. Lett., 50 (1980) 92–104. 11. E. A. Crecelius, “Prediction of marine atmospheric deposition rates using 7Be deposition velocities”, Atmos. Environ., 15, 1981, pp 579–582. 12. K. K. Turekian, L. K. Benninger and E. P. Dioan, “7Be and 210Pb total deposition fluxes at New Haven”, Connecticut and at Bermuda, J. Geophys. Res. 88, 1983, pp 5411–5415. 13. G. Lujaniene, “Study of removal processes of 7Be and 137Cs from the atmosphere”, Chechoslovak, J. Phys.,53, 2003, pp S57–S65. 14. C. Papastefanou and A. Ioannidou, “Influence of air pollutants in the 7Be size distribution of atmospheric aerosols”, Aerosol Sci.Technol. 24, 1996, pp 102–106. 15. N. Alegrıa, M. Herranz, R. Idoeta and F. Legarda, “Study of 7Be activity concentration in the air of northern Spain”, Journal of Radioanalytical and Nuclear Chemistry, 286, 2010, pp 347-351 

Correlation Between Beryllium-7 in Atmospheric Deposit and Ground Level Air in Serbia for 2014 Year

http://vinar.vin.bg.ac.rs/bitstream/id/21436/RAD2015_Rajacic_CorrelationBetweenBeryllium-7.pdf

Correlation Between Beryllium-7 in Atmospheric Deposit and Ground Level Air in Serbia for 2014 Year

Abstract

Similar works

Full text

Available Versions

Repository of the Vinča Nuclear Institute (VinaR)