ROLE OF LANDSCAPE FACTORS IN THE DYNAMICS OF 137Cs CONTAMINATION FIELD IN BRYANSK POLESSYE

E. V. Kvasnikova, O. M. Zhukova, E. D. Stukin, E. N. Borisenko, and A. E. Samonov

A basin method, i.e., integral study of geochemical landscape functions in small river catchments, was used in field works and in analysis of measurement data to investigate the transformation of 137Cs contamination spots. The study shows that the loss of 137Cs in the 0–5 cm soil layer for 19 years after deposition is considerable in hydromorphic soils of Bryansk Polessye: 27–46% of total in floodplain soils with different gley conditions and 70% in floodplain bogs reach. The large diversity of 137Cs vertical profiles in soils results in the considerable variability of the dose-rate field of 137Cs gamma-irradiation over the surface, from 1.6 to 7 × 10–6 R/hour per each 37 kBq/m2. The lowest levels were found for the arable lands like floodplain bogs due to the natural conditions that re-distributed and tourbed 137Cs by analogy with ploughing up.

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