Molecule Diffusion Behavior of Tritium and Selenium in Mongolia Clay Rock by Numerical Analysis of the Spatial and Temporal Variation

Clay rock in the Tamusu (TMS) area Inner Mongolia province is one candidate as a geological disposal site for highly radioactive waste China. The diffusion behavior of HTO and Se(IV) clay was studied by through-diffusion (TD) experiments numerical analysis to determine spatial temporal variation. A minimum error conducted coefficients compacted TMS clay. TD experimental results showed that Se reached steady state within 7 50 days, respectively, apparent (Da) decreased with increases density. In fact, there retardation intact rock. two-site sorption model applied simulate fast slow quantitatively.