caa a22 4500 465730272 CHVBK 20180323111739.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02049355 doi (NATIONALLICENCE)springer-10.1007/BF02049355 Plutonium isotopes in the surface air in Japan: Effect of Chernobyl accident [Elektronische Daten] [K. Hirose, Y. Sugimura] Plutonium isotope concentrations in the surface air at Tsukuba, Japan are reported during the period from 1981 to the end of 1986. The239,240Pu concentration in the surface air, which showed a marked seasonal variation with a spring maximum and fall minimum, decreased until the end of 1985 according to the stratospheric residence time of 1.15 years. In May 1986, elevated239,240Pu concentrations with high238Pu/239,240Pu activity ratios were observed. The serial trend of plutonium concentration in the surface air is similar to the concentrations of the Chernobyl-released radionuclides. These findings suggest that a significant part of the plutonium in the surface air in May 1986 was due to the Chernobyl fallout. The size distribution of plutonium bearing particles indicates that plutonium isotopes were mechanically released in the Chernobyl accident. The surface air concentration of plutonium from the Chernobyl accident was much lower than the concentrations of the volatile fission products, and increased the monthly mean239,240Pu concentration by only 0.03 μBqm−3. Akadémiai Kiadó, 1990 Hirose K. Geochemical Laboratory, Meterological Research Institute, Nagamine 1-1, 305, Tsukuba, Ibaraki, Japan aut Sugimura Y. Geochemical Laboratory, Meterological Research Institute, Nagamine 1-1, 305, Tsukuba, Ibaraki, Japan aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 138/1(1990-01-01), 127-138 0236-5731 138:1<127 1990 138 10967 https://doi.org/10.1007/BF02049355 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02049355 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hirose K. Geochemical Laboratory, Meterological Research Institute, Nagamine 1-1, 305, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Sugimura Y. Geochemical Laboratory, Meterological Research Institute, Nagamine 1-1, 305, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 138/1(1990-01-01), 127-138 0236-5731 138:1<127 1990 138 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer