[Features of anthropogenic radionuclide distribution in soil and plants of the agricultural lands]
2005
Avtushko, M.I. | Buzdalkina, S.A. | Timofeev, S.F.(The National Academy of Sciences, Minsk (Belarus). Institute of Radiology, Gomel)
The distribution of anthropogenic radionuclide 241Am, 134,137Cs and 90Sr in soils and plants of agricultural lands of Bragin district bordering the resettlement and alienation zones around the Chernobyl NNP has been studied. It is shown that radionuclide contamination of soil on these sites (N=45) corresponds to the sequence 137Cs 90Sr 241Am Cs134. The specific activity of 137Cs (the maximum value of 6 892,8 Bq/kg) in soil exceeds the contents of 90Sr (the maximum value of 111,Bq/kg) approximately by an order. The average level of contamination in soil for 241Am is 3,7+-2,3Bq/kg and the maximum is 11,9Bq/kg. The content of 137Cs and 90Sr in plants (N=74) in all tests does not exceed the national permissible level of radionuclide content in agricultural production and forages. 241Am and 134Cs were not detected in any plant sample. An uptake of 241Am from ploughland to grain is estimated and is shown that 241Am content in soil of the studied agricultural lands even at the level of maximum values can not lead to uptake by grain to the rate exceeding the annual limits of the national radiation safety standards
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