Study on Changes of Radionuclides Concentration in Pine Needles on Pref. Ishikawa and Its Transfer Process during Two Decades.
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Changes of Radionuclides concentrations, i.e., <SUP>137</SUP>Cs, <SUP>7</SUP>Be and <SUP>40</SUP>K, in pine needles were investigated in some sampling stations in Pref. Ishikawa during two decades. From 1979 to 1989, artificial nuclide <SUP>137</SUP>Cs 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, <SUP>137</SUP>Cs was hardly detected in pine needles except a particular area where <SUP>137</SUP>Cs accumulated in soil, while natural nuclides, <SUP>7</SUP>Be and <SUP>40</SUP>K, were detected in pine needles and soil.<BR>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.
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