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20年間にわたる石川県における松葉中の放射性核種濃度の時間変化を示しながら, その時々に存在した量の由来について検討し, 10年ごとの変化から放射性核種の移行過程と外因的要因との関係を検討した。その結果, 松葉における天然核種の40Kの濃縮係数は土壌濃度と反比例の関係を示し, 137Csも同様な傾向を示した。この関係から137Cs全量のうち経根吸収分を除いた分を大気からの沈着分として, また7Beは短半減期のため検出されるほとんどが大気からの沈着分と考え, それぞれの移行速度を推定して沈着速度と比較した。その結果, 一般に認められた降水に対する粉塵の沈着速度よりはやや小さいもののオーダー的に同程度の値を示した。従来, 測定や観測が不可能に近い137Csの松葉の吸収が時間の大幅な経過やそれに伴う環境状況の変化から観測可能になり, 137Csに関する移行係数や移行速度や7Beの移行速度が推定可能となった。 Changes of Radionuclides concentrations, i.e., 137Cs, 7Be and 40K, in pine needles were investigated in some sampling stations in Pref. Ishikawa during two decades. From 1979 to 1989, artificial nuclide 137Cs had been detected in pine needles, soil and air-suspended particles because of Chinese nuclear weapon test (1979) and Chernobyl's nuclear power plant accident (1986) . But since 1990, 137Cs was hardly detected in pine needles except a particular area where 137Cs accumulated in soil, while natural nuclides, 7Be and 40K, were detected in pine needles and soil.It was found that radionuclides transfered into pine needles by deposition on leaf and adsorption from root. It seems that in eayly decade both deposition and adsorption dominated as a transfer process in pine needles, but in a later decade, only adsorption dominated

Study on Changes of Radionuclides Concentration in Pine Needles on Pref. Ishikawa and Its Transfer Process during Two Decades.