Abstract
A solid safety assessment of spent nuclear fuel is strongly relied on the deep understanding in the correlation between nuclides transport and geological materials. In this study, we use linear regression to evaluate the connection between nuclide uptake and local mineral composition. Adsorption experiments were finished under aerobic and anaerobic condition. In both conditions, determined K_d values of Cs, Se and U adsorption to H-granite lie in the region between 60 mL/g to 90 mL/g, 0 mL/g to 20 mL/g, and 400 mL/g to 600 mL/g, respectively. Importantly, we found that Cs uptake is positively correlated to the content of K-feldspar、muscovite、calcite and epidote, while Se and U uptake is positively correlated to the content of quartz、biotite and chlorite. To simulate the nuclide transport mechanism in the real geological condition, diffusion experiment with sliced granite was carried out and there were no significant breakthroughs noted in the end of two years of diffusion. Along with the distribution coefficient determined, our results would be an important reference for the safety assessment in the near future.