Radioactive Nuclide Migration Experiment in Saturated Zhejiang Red Clay
放射性核素在饱和浙江红粘土中的迁移

This paper probes into the radioactive nuclide migration mechanism in the red clay by layered clay column method.The vertical section concentration distribution and their migration velocity of six kinds of radioactive nuclides,such as 137Cs, 85Sr, 60Co, 144Ce, 155Eu and 237Np,were measured by 28 days saturated clay column dynamic adsorption desorption experiment.In order to calculate the retardation factor of these nuclides according to the water infiltration flux in site the diffusion experiment was conducted,and the flow velocity and the soil coefficient porosity were also measured.And the retardation factor and adsorption distribution coefficient of these nuclides in red clay were calculated by clay column loading density,effective porosity,and flow velocity in soil.The results showed that Zhejiang red clay has high adsorption distribution coefficients and retardation factors to 137Cs, 85Sr, 60Co, 144Ce, 155Eu and 237 Np.The adsorption distribution coefficients and retardation factor to 137Cs are 2388 ml·g-1 and 7732 respectively,and the adsorption distribution coefficients and retardation factor to 85 Sr are 1432 ml·g-1 and 4645 respectively.