Concentrations of Be-7, Cs-137 and Pb-210 in ground level air in Belgrade area from 1985 to 2001

Concentrations of Be-7, Cs-137 and Pb-210 in ground level air were determined from 1994-2001 for Be-7, from 1985-2001 for Cs-137 and from 1985-2001 for Pb-210. The average monthly concentrations of 7 Be in ground level air were in the range of 0.6-7.4 mBq/m(3) with pronounced one or two summer or early fall maxima and a minimum in winter. The average air concentrations for 137Cs apart from the few fold increase in concentration in 1986 due to the Chernobyl nuclear accident, were from 0.5-6.0x10(-5) Bq /m(3). A spread maximum in the spring/summer periods and pronounced maxima in winters after the Chernobyl accident contributed to local surface dust resuspension effects was observed. The maximum concentrations for Pb-210 were generally observed in falls, with the average concentration values in the range of 2.5-34.0 x 10(-4) Bq/m(3) in the period.Conference on Applied Physics in Serbia, May 27-29, 2002, Belgrade, Yugoslavi