[2B10-14] Fukushima Daiichi NPT Accident Waste Treatment 7

[2B14] Synthesis and Characterization of immobilization of Cs in Apatite Wasteforms Containing Al

*Shun Kanagawa¹, ZhiLi Dong², Tim White², Takatoshi Hizikata³, Yukako Aoyama¹, Kenji Takeshita¹ (1. Tokyo Institute of Technology, 2. Nanyang Technological University, 3. Central Research Institute of Electric Power Industry)

Keywords:Synthesis of Inorganic Materials, Cs Immobilization

Because of Tokyo Electric Power Company Fukushima Daiichi nuclear power plant accident in 2011, radioactive Cesium (Cs) was discharged to the atmosphere. Cs immobilization method for long term storage are being studied. In this study, I choose apatite structure for immobilization materials for Cs. Apatites confirm to general formula M1₄M2₆(ZO4)₆X₂, where M1 & M2 includes larger mono-, di-, and trivalent cations, Z are metalloids, and X represents halides and anion radicals. Apatite structure is relatively stable under irradiation. We synthesized novel apatite structure materials containing simulated radioactive Cs with strontium (Sr) and aluminum (Al) by conventional solid state reaction at relatively low temperature of 500℃. Product quality was verified by electron microscopy and chemical analysis. Chemical analysis found Cs/Sr ratios as expected with almost all Cs retained in the apatite products.