Temperature Dependence of the Sorption and Distribution of Cs, Sr, and Am on Fractured Rock Minerals of the Nizhnekansky Massif

IF 0.9 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Radiochemistry Pub Date : 2025-02-17 DOI:10.1134/S1066362224060183

A. A. Rodionova, I. E. Vlasova, V. O. Yapaskurt, V. G. Petrov, S. E. Vinokurov

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Abstract

The heat generation by high-level waste raises the temperature in the near-surface zone of the repository, and the effect of this factor on the behavior of radionuclides in the host fractured rock environment upon deep disposal of radioactive waste (RW) should be considered in predictive modeling. The sorption behavior and spatial distribution of Cs, Sr, and Am on the surface of a fractured rock sample of the Nizhnekansky massif depending on temperature were studied. The distribution coefficients of Sr and Am on the sample surface increase with increasing temperature from 25 to 70°C, whereas the Cs distribution coefficient does not increase. This difference may be associated with different mechanisms of the sorption of these radionuclides. Cs, Sr, and Am are nonuniformly distributed on mineral phases of the fractured sample and are preferentially retained on Ca(Sr)-zeolite forming the mineral composition of the fractures. The coefficients of the phase distribution of radionuclides on separate mineral phases/associations were determined by quantitative analysis.

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.