1. Insutitue for Environmental Sciences, Ienomae 1-7, Obuchi, Rokkasho-mura, Kamikita-gun, Aomori 039-3212 Japan
2. Kyushu Environmental Evaluation Association, Matsukadai 1-10-1, Higashi-ku, Fukuoka 813-0004 Japan
3. CEA/DIF/DASE/SRCE, 91297 Arpajon Cédex France
4. Radioisotope Center, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581 Japan
5. National Institute for Fusion Science, Oroshi-cho 322-6, Toki, Gifu 509-5292 Japan