Radionuclide Concentration in Ground-Level Air from 1986 to 1987 in North Germany and North Norway

摘要

The activity concentration of various fission products and some other radionuclides (e.g. Be-7, Na-22, K-40 and Pb-210) contained in surface air were determined by gamma -spectroscopy. The mean monthly acitvity concentrations of up to 30 radionuclides measured in 1986 and 1987 in Brunswick, Berlin and Skibotn (North Norway) are tabulated. The Chernobyl accident of April 26, 1986, resulted in 1986 in an annual mean Cs-137 activity concentration of 2.4 mBq/m(sup 3) in Brunswick, 8.8 mBq/m(sup 3) in Berlin and 0.3 mBq/m(sup 3) at Skibotn. In 1987 the Cs-137 concentrations were just about 1% of these values. Occasionally fresh fission products from other sources were detected as e.g. I-131 in March 1987 (very likely released from a reactor site in Ukraine) and in August 1987 (released from an underground nuclear test on Novaja Zemlya together with other short-lived fission products). The effective dose equivalent due to inhalation of fission products is estimated for all three sites and compared with the Pb-210 inhalation dose. (ERA citation 13:052119)