Affiliation: | (1) Radioisotope Center, Japan Atomic Energy Research Institute, Oarai-machi, 311-13 Ibaraki-ken, Japan;(2) Present address: Toyohashi University of Technology, Tenpaku-cho, 440 Toyohashi, Japan;(3) Present address: Nagoya Municipal Industrial Research Institute, Rokuban-cho, Atsuta-ku, 456 Nagoya, Japan |