Temporal changes of beryllium-7 and lead-210 in ground level air in Serbia

Abstract

7Be, 210Pb and 137Cs activity concentrations in ground level air at five monitoring stations (MS Vinca, Zeleno Brdo, Zajecar, Vranje and Zlatibor) in Serbia were determined during the period from May 2011. to September 2012., as part of the project monitoring of Serbia. Activity of the radionuclides in air was determined on an HPGe detector (Canberra, relative efficiency 20 %) by standard gamma spectrometry. Concentrations of cosmogenic 7Be, ranged from 1.5 to 8.8 mBq m-3 and exhibit maxima in the spring/summer period. The maximum concentrations for 210Pb were generally obtained in the fall for all investigated locations, and concentrations were in range 3.6 - 30 ? 10-4 Bq m-3. The activity concentrations of anthropogenic 137Cs in ground level air, during the observed period, were at level 0.3 - 8 ?Bq m-3. The variations in 7Be/210Pb activity ratio for the investigated stations are also presented.