Abstract
The article presents data on the content and assessment of parameters of artificial 137Cs and 90Sr accumulation by steppe motley grasses in the fallout area in borehole 101 of the former ‘Sary-Uzen’ testing site of the Semipalatinsk Test Site (STS). 137Cs activity concentration in land cover of the study area was found to reach 2,700 Bq/kg, 90Sr – up to 3,370 Bq/kg. The ranges of Tf values for 137Cs (0.0030-0.021) and 90Sr (0.064-0.36) are one order of magnitude each. 90Sr is most accumulated in plants. Its Tf maxima are noted in the dump zone of the explosion crater. No Tf variation dependences on the distance from ground zero were found for either radionuclide. At the same time, Tf values are one order of magnitude higher than the ones previously obtained for ground zeros of aboveground nuclear tests and one order of magnitude lower than Tf values for these radionuclides obtained as a whole for pastures as reported by IAEA.
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