title: Plutonium,137Cs and uranium isotopes in Mongolian surface soils.
abstract: Plutonium (238Pu and239,240Pu),137Cs and plutonium activity ratios (238Pu/239,240Pu) as did uranium isotope ratio (235U/238U) were measured in surface soil samples collected in southeast Mongolia. The239,240Pu and137Cs concentrations in Mongolian surface soils (<53 μm of particle size) ranged from 0.42 ± 0.03 to 3.53 ± 0.09 mBq g-1and from 11.6 ± 0.7 to 102 ± 1 mBq g-1, respectively. The238Pu/239,240Pu activity ratios in the surface soils (0.013-0.06) coincided with that of global fallout. The235U/238U atom ratios in the surface soil show the natural one. There was a good correlation between the239,240Pu and137Cs concentrations in the surface soils. We introduce the migration depth to have better understanding of migration behaviors of anthropogenic radionuclides in surface soil. We found a difference of the migration behavior between239,240Pu and137Cs from137Cs/239,240Pu -137Cs plots for the Mongolian and Tsukuba surface soils; plutonium in surface soil is migrated easier than137Cs.
authors.affiliation: Department of Material and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Ciyoda-Ku, Tokyo 102-8554, Japan. Electronic address: hirose45037@mail2.accsnet.ne.jp.
authors.forename: K
authors.initials: K
authors.lastname: Hirose
authors.affiliation: Department of Material and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Ciyoda-Ku, Tokyo 102-8554, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kikawada
authors.affiliation: Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute, Tsukuba, Ibaraki 305-0052 Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Igarashi
authors.affiliation: Soil Environment Division, National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8601, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Fujiwara
authors.affiliation: Institute of Meteorology and Hydrology, Ulaanbaatar 46, Mongolia.
authors.forename: D
authors.initials: D
authors.lastname: Jugder
authors.affiliation: Department of Material and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Ciyoda-Ku, Tokyo 102-8554, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.affiliation: Department of Material and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Ciyoda-Ku, Tokyo 102-8554, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Oi
authors.affiliation: Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-Ku, Tokyo 152-8550, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nomura
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D008986:Mongolia; D011005:Plutonium / Q000032:analysis*; D011834:Radiation Monitoring; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D014501:Uranium / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D012990:Soil Pollutants, Radioactive; D014501:Uranium; D011005:Plutonium
keywords: (137)Cs/(239,240)Pu activity ratio; (235)U/(238)U isotope ratio; (238)Pu/(239,240)Pu activity ratio; (239,240)Pu; Migration; Mongolian surface soil