通気層中における放射性核種の挙動

概要

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In order to clarify the behavior of radionuclides in an aerated sand layer, the column experiments with radioactive tracers (60Co, 85Sr and 137Cs) were carried out at different carrier concentrations (1.1×10-10-1×10-3mol/l). The effluent and migration of radionuclides were examined by measuring the radioactivity of effluent passed through the outlet of a column and sand collected from a column. The values of relative concentration of effluent (effluent ratio) were small in the low concentrations of stock solution below 10-6mol/l. At the high concentrations above 10-4mol/l, they became larger with increasing effluent volume. The relative concentrations of adsorption (adsorption ratio) decreased exponentially with depth of sand layer. Its values, however, indicated the smooth decrease with heightening the concentrations of stock solution. In addition, the observed values of 85Sr2+ and 137Cs+ at the depth d1/10 from sand surface corresponding to one-tenth of the relative concentration agreed relatively with the calculated values obtained from the dispersion equation. Hence, this value d1/10 under these experimental conditions may be one of the indicators for the prediction of migration of 85Sr2+ and 137Cs+ (cations) in an aerated sand layer.
日本保健物理学会の論文