About TOKUYAMA H
About Fukui Prefecture Environmental Radiation Res. and Monitoring Center, Fukui-shi, JPN
About IGARASHI S
About Fukui Prefecture Environmental Radiation Res. and Monitoring Center, Fukui-shi, JPN
About Journal of Environmental Radioactivity
About cosmogenic isotope
About ナトリウム22
About Environmental contamination and its prevention
About 日本
About 福井
About 宇宙線
About 環境
About バックグラウンド
About 季節変動