title: Determination of 240Pu/239Pu atom ratio in seawaters from the East China Sea.
abstract: The (240)Pu/(239)Pu atom ratios in seawater samples on the East China Sea continental shelf were measured. These ratios for surface and bottom waters had no significant difference. They were significantly higher than the average global fallout ratio of 0.18. It was proposed that the oceanic currents are accounted for delivery of close-in Pu from the Pacific Proving Grounds (PPG) to the studied areas. The contribution of the PPG close-in fallout was calculated to be 40 % on average. The (240)Pu/(239)Pu atom ratios should provide useful background data before the expected expansion of nuclear power capacity in East and South Asian countries and for distinguishing future sources of Pu.
authors.affiliation: Environmental Radiation Effects Research Group, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan. myamada@cc.hirosaki-u.ac.jp
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Yamada
authors.forename: Jian
authors.initials: J
authors.lastname: Zheng
mesh_terms: D002681:China; D011005:Plutonium / Q000032:analysis*; D011834:Radiation Monitoring; D011847:Radioactive Fallout / Q000032:analysis*; D012623:Seawater / Q000032:analysis*; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D011847:Radioactive Fallout; D014875:Water Pollutants, Radioactive; D011005:Plutonium