Imaging XAFS analysis of simulated radioactive waste glass by bottom drain test

Okamoto, Yoshihiro  ; Nagai, Takayuki  ; Shiwaku, Hideaki   ; Seki, Katsumi*; Kobayashi, Hiromi*; Homma, Masanobu*; Hatakeyama, Kiyoshi*

The chemical state of simulated radioactive waste glass prepared by bottom drain tests was investigated by XAFS and imaging XAFS analyses. Gas bubbling operation at melting was added in the test. The XAFS measurements of Cr, Mn, Fe and Ce were performed to evaluate redox (reduction and oxidation) state in the simulated glass. Behavior of platinum group elements in the simulated glass was observed from the imaging XAFS analysis. The XAFS analysis suggested redox state of the glass changed depending on the waste content and the gas bubbling. The imaging XAFS analysis showed that aggregation of platinum group element was reduced by the gas bubbling.