Pages: 381-388

Authors: Jelena V. Ajtić, Dragana J. Todorović, Jelena D. Nikolić,
Vladimir S. Djurdjević

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.

Key words: radioactivity, beryllium-7, lead-210, air, sun-spot number, climate variable

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