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Information × Registration Number 0207U000260, 0105U006206 , R & D reports Title Research of permanence of the caesium-137 long-term fixation by an organic-mineral soil complex popup.stage_title Head Kononenko Ludmilla Vassyllivna, Registration Date 17-01-2007 Organization Institute of environment geochemistry popup.description2 Work is devoted to the study of contribution of separate fractions and components of soil in the long-term Cs-137 unexchange fixation, possible factors and processes which can cause its remobilization. On the basis of experimental data and kinetic model of radionuclide speciation, the rate constants of Cs-137 immobilization and remobilization in the explored soils of the Exclusion Zone of Chernobyl NPP were determined. Experimental model study of dynamics of Cs-137 sorption by sod-podzol soil and its separate fractions was performed. It is set, that due to slower Cs-137 remobilization on the finest soil fraction, this fraction in course of time turns out the most enriched by radionuclide fixed species. The experimental data indicate heterogeneity of reactionary centers of sod-podzol soil. The unexchange sorption of Cs-137 takes place on the reactionary centers of three types, exchange sorption - on the reactionary centers of two types. Rate constants of Cs-137 fixation on the centers of the III type are commensurable with the values of rate constants of Cs-137 immobilization, determined by us for the contaminated soils of Exclusion Zone. High soil moisture and abundant vegetation promote the increasing of Cs-137 mobile species contents in soil. At humification of vegetable remains, returning of Cs-137 accumulated by the plants in soil and formation of Cs-137 mobile compounds with fulvic acids are taking place. Product Description popup.authors popup.nrat_date 2020-04-02 Close