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. [Projekat Ministarstva nauke Republike Srbije, br.
43007: Studying climate change and its influence on the environment: impacts,
adaptation and mitigation]
part ment of Neu tron Ac ti va tion Anal y sis and Ap plied Re search, Di vi sion of Neu tron Phys ics, Frank Lab o ra tory of Neu tron Phys ics, Joint In sti tute for Nu clear Re search, Dubna, Rus sia Sci en tific pa per
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