Affiliation: | 1.Sapporo University, Nishioka 3-7-3-1, Toyohira-ku, Sapporo, Hokkaido, 062-8520, Japan ;2.Japan Atomic Energy Agency, Nakamaru 1-22, Yamadaoka, Naraha-machi, Futaba-gun, Fukushima, 979-0513, Japan ;3.The University of Aizu, Tsuruga, Ikki-machi, Aizuwakamatsu, Fukushima, 965-8580, Japan ; |