Migration behavior of multivalent radionuclides from fully radioactive waste glass in compacted sodium bentonite

摘要

Samples of fully radioactive glass sandwiched in bentonite for 15 years at room temperature under aerobic conditions were used to investigate the coupled processes of Eu, Pu, Am and Cm release from fully radioactive waste glass and their transport in compacted bentonite. The observed concentrations of the radionuclides in compacted sodium bentonite contacted on the glass were good agreement with their solubilities calculated from thermodynamic data. It was considered that an actinide and lanthanide leached from the glass were controlled by their solubility. The diffusion of Am in the bentonite is fitted to the experimental data based on the one-dimensional diffusion model considering several species.