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Okamoto, Yoshihiro; Nakada, Masami; Akabori, Mitsuo; Komamine, Satoshi*; Fukui, Toshiki*; Ochi, Eiji*; Nitani, Hiroaki*; Nomura, Masaharu*
Proceedings of 4th Asian Conference on Molten Salt Chemistry and Technology & 44th Symposium on Molten Salt Chemistry, Japan, p.47 - 52, 2012/09
The molten state of the simulated high-level waste glass and the behavior of ruthenium element in the melt were investigated by using synchrotron radiation based X-ray imaging technique. Melting, generating and moving of bubbles, condensation and sedimentation of ruthenium element were observed dynamically in continuous 12-bit gray-scale images from the CCD camera. The existence of ruthenium in the X-ray CCD image was emphasized over the energy of Ru K-absorption edge. X-ray intensity was obtained easily by digitalizing gray-scale values in the image. Position sensitive imaging X-ray absorption fine structure (XAFS) measurement was performed to clarify the chemical state of ruthenium element in the melt.
Shibata, Hiroki; Hayashi, Hirokazu; Koyama, Tadafumi*
Proceedings of 4th Asian Conference on Molten Salt Chemistry and Technology & 44th Symposium on Molten Salt Chemistry, Japan, p.257 - 263, 2012/09
The electrochemical properties of curium ions in LiCl-KCl eutectic melts were studied in the temperature range from 718 to 823 K. A small electrochemical cell used in the present study was designed for the electrochemical measurement of a small amount (1-20 mg) of the highly radioactive minor actinides contained in molten salts in a hot cell. Our data of apparent standard potentials of Cm
/Cm couple are reasonably agreement with Osipenko's data (2011) and are lower than Martinot's data (1975). The validity of the reported apparent standard potentials was discussed.