1. Radioactive Waste Processing and Disposal Research Department, Japan Atomic Energy Agency (JAEA), Naka-gun, Ibaraki, Japan
2. Reprocessing Analysis Department, Japan Nuclear Fuel Chemical Analysis co., Ltd, Rokkasho-Mura, Aomori, Japan
3. Horonobe Underground Research Center, Japan Atomic Energy Agency (JAEA), Teshio-gun, Hokkaido, Japan