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
85Sr
2+ 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
85Sr
2+ and
137Cs
+ (cations) in an aerated sand layer.
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