About KOBASHI ASAYA
About 東京大学大学院理学系研究科化学専攻
About Radioisotopes
About radioisotope
About evaluation
About Paper
About ash
About radium isotope
About thorium 232
About potassium isotope
About dose equivalent
About spectrochemical analysis
About natural radioactive nuclide
About radium 226
About radium 228
About potassium 40
About equivalent dose
About Spectrometry, Gamma
About radiation dose
About Health impact assessment
About Environmental contamination and its prevention
About 紙
About 灰
About 天然放射性核種
About 健康への影響評価