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Report No.
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Development of cesium-free mineralization for volume reduction and reuse of radioactive contaminated soil

Shimoyama, Iwao; Honda, Mitsunori; Kogure, Toshihiro*; Baba, Yuji; Hirao, Norie*; Okamoto, Yoshihiro; Yaita, Tsuyoshi; Suzuki, Shinichi

The decontamination method has not been established for soil contaminated with radioactive Cs. We adopted weathered biotite (WB) which sorbed non-radioactive $$^{133}$$Cs as a model contaminated soil and applied heating treatment to the WB at 700$$^{circ}$$C under a low pressure condition with CaCl$$_{2}$$ or KCl salt. X-ray fluorescence analysis showed that almost all Cs was removed after the heating at 700$$^{circ}$$C with CaCl$$_{2}$$ and Ca became dominant with temperature. X-ray diffraction and transmission electron microscopy analysis indicated some phase transition from WB after the heating treatment. These results suggest a model that Ca derived from the salt induced the formation of augite, and that Cs$$^{+}$$ were eliminated from the product as these large-size cations cannot constitute augite. Based on this model, we propose Cs free mineralization which can achieve decontamination and reuse of soil in Fukushima.

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