Samples of precipitations were collected quarterly and analyzed for90Sr and137Cs. The values obtained ranged from 0.001 to 0.004 Bq dm–3, with a maximum of 0.010 Bq dm–3 for90Sr;137Cs values ranged from 0.001 to 0.005 Bq dm–3, with a maximum of 0.070 Bq dm–3. The highest values were observed during the 2nd and 3rd quarters of 1981.
The environmental factors considered are: surface water, ground water, drinking water, soil, sediment and spontaneous vegetation. The analyses performed showed a low level of radioisotopes. The mean values recorded were: 4.22×10–3 Bq dm–3 for137Cs, 2.97×10–3 Bq dm–3 for90Sr, 14.9 Bq dm–3 for3H and 1.07 g dm–3 for U, in the Danube waters. The -spectrometric analysies revealed lines corresponding to40K and the to the natural decay series of U and Th. There have been also identified the artificial radionuclides137Cs and60Co in sediment,95Zr and95Nb in the 1981 vegetation. All artificial isotopes resulted from atmospheric fallout.
Authors:N. Păunescu, R. Mărgineanu, and A. Iorgulescu
This work shows the variation of90Sr and137Cs in atmospheric fallout in the Bucharest-Mgurele area during 1986–1987. The amount of90Sr in the fallout was estimated to be about 900 Bq.m–2 in 1986 and about 9.2 Bq.m–2 in 1987. The amount of137Cs was estimated to be 13300 and 615 Bq.m–2 in 1986 and 1987, respectively.
Authors:N. Paunescu, D. Galeriu, R. Margineanu, and A. Iorgulescu
This paper presents the results of radioactivity studies of environmental factors such as surface water, sediment, aquatic vegetation and soil. The concentrations of137Cs,90Sr,3H, U, Ca, and Mg in water samples were determined by radiochemical and chemical methods. Gamma-spectrometric analyses were performed for all the samples. The analysis showed a decrease in concentrations of137Cs in water, aquatic vegetation and sediment, but a constant level of137Cs activity in soil (0–5 cm depth). The average concentrations of90Sr,3H, U, Ca and Mg were about 7 mBq/l, 11 Bq/l, 0.6 g/l 60 mg/l and 11 mg/l, respectively.