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Oral presentation

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*

no journal, , 

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.

Oral presentation

Evaluation of Gibbs free energies of formation of Gd-Cd intermetallic compounds using electrochemical techniques

Akashi, Shin; Shibata, Hiroki; Sato, Takumi; Hayashi, Hirokazu

no journal, , 

no abstracts in English

Oral presentation

Decontamination test of radioactive contaminated soil by Cs-free mineralization with alkaline chlorides

Shimoyama, Iwao; Kogure, Toshihiro*; Okumura, Taiga*; Baba, Yuji; Okamoto, Yoshihiro

no journal, , 

In this work, we examined Cs-free mineralization (CFM) for decontamination of Fukushima soil with four alkaline chloride additives below 800$$^{circ}$$C in air and under low-pressure conditions. In the case of CaCl$$_{2}$$, radioactivity concentration largely decreased in both air and low-pressure conditions, and decontamination ratio reached to 97% at 790$$^{circ}$$C. In the case of MgCl$$_{2}$$, we found a tendency that decontamination ratio was higher under low-pressure condition than in air and it was more than 99% after three cycles of heat treatments at 695$$^{circ}$$C. KCl and NaCl reagents also showed similar tendency, and decontamination ratio reached to 93% and 97% for KCl and NaCl, respectively, after five cycles of heat treatments at 790$$^{circ}$$C. Structural analysis of products clarified that heat treatments with CaCl$$_{2}$$ and MgCl$$_{2}$$ decomposed biotite which is the major Cs sorbent in the soil in Fukushima. On the other hand, similar decomposition was not observed when KCl and NaCl were used as additives. Based on these results, CFM was confirmed to be effective for soil decontamination, and we found that Cs removal process depends on the valence of metal ions as chlorides.

Oral presentation

Cesium removal and separate from Fukushima weathered biotite using molten salt electrochemistry

Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Shimoyama, Iwao; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

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