Archives2018Vol. 58, No. 1pp. 85-97

Article

Assessment of Dynamics of 137Cs and 90Sr Uptake in Higher Aquatic Vegetation in Water Reservoirs of Different Types in the Belorussian Sector of the ChNPP Exclusion Zone

Kalinichenko S.A.1

1 Polesye State Radiation-Ecological Reserve, Khoiniki, Republic of Belarus

Abstract

Based on long-term observations and the analysis of long-lived radionuclides in different types of water macrophytes, considerable differences in the 137Cs and 90Sr uptake were discovered. The uptake and excretion rate of 90Sr in higher aquatic vegetation was mostly higher than that of 137Cs. A high intraspecific variation in the 137Cs и 90Sr concentration in different annual vegetation periods depending on ecological groups was established. While assessing the seasonal variation dynamics of the activity concentration in higher aquatic vegetation, in most cases the tendency to an increase in the 137Cs and 90Sr concentration by the end of the vegetation period and a decrease by the wilting period (September) was observed. Based on the years of studies, the concentration factors (Cf) of 137Cs and 90Sr, as well as the 90Sr/137Cs ratio were established for dominating hydrophyte species of different model types of water reservoirs. The analysis of long-term dynamics of the radionuclide uptake in higher hydrophytes shows that while the concentration of 137Cs decreases with time after the Chernobyl fallout, the situation regarding 90Sr is the opposite in most cases.

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