|About this Abstract
||Materials Science & Technology 2012
||Materials Issues in Nuclear Waste Management in the 21st Century
||Migration of Iodine Solidified in Ettringite into Compacted Bentonite
||Kazuya Idemitsu, Yoshihiko Matsuki, Masanao Kishimoto, Yaohiro Inagaki, Tatsumi Arima, Yoshiko Haruguchi, Yu Yamashita, Michitaka Sasoh
|On-Site Speaker (Planned)
Radioactive iodine, I-129, bearing materials are produced from nuclear reprocessing plants. Cement is one of the materials for solidification of radioactive iodine. Here iodine is fixed in ettringite mineral as iodate ion. Radioactive wastes include a certain quantity of I-129 should be disposed in deep underground because the half-life of I-129 is 16 million years. When the wastes disposed, compacted bentonite would be used as a buffer material as well as for high-level radioactive waste disposal. It is concerned that radioactive iodine will be leaked from disposed waste through compacted bentonite for prolonged periods of time. Release behavior of iodine from ettringite was studied in the reducing condition by using electro-migration method as well as diffusion experiments of iodine ion and iodate ion in compacted bentonite.