title: Distribution of nuclear bomb Pu in Nishiyama area, Nagasaki, estimated by accurate and precise determination of 240Pu/239Pu ratio in soils.
abstract: Plutonium isotopes in forest soils collected in Nishiyama area, Nagasaki, were successfully determined by high resolution inductively coupled plasma mass spectrometry after the treatment with a microwave decomposition system. The (240)Pu/(239)Pu atom ratios observed in the samples in the Nishiyama area were obviously lower than the range of the global fallout. The low ratios (minimum 0.032) observed in Nishiyama area indicated the influence of detonation of the Pu nuclear weapon in 1945. Since the area is contaminated also by global fallout, the (240)Pu/(239)Pu atom ratio can be more sensitive indicator of bomb-derived Pu than Pu activity concentration.
authors.affiliation: National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba-shi 263-8555, Japan. s_yoshid@nirs.go.jp
authors.forename: S
authors.initials: S
authors.lastname: Yoshida
authors.forename: Y
authors.initials: Y
authors.lastname: Muramatsu
authors.forename: S
authors.initials: S
authors.lastname: Yamazaki
authors.forename: T
authors.initials: T
authors.lastname: Ban-Nai
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis; D004784:Environmental Monitoring; D019015:Geologic Sediments; D007564:Japan; D013058:Mass Spectrometry / Q000379:methods; D008872:Microwaves; D009689:Nuclear Warfare; D011005:Plutonium / Q000032:analysis*; D011834:Radiation Monitoring; D011847:Radioactive Fallout / Q000032:analysis; D011868:Radioisotopes / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D011847:Radioactive Fallout; D011868:Radioisotopes; D012989:Soil Pollutants; D012990:Soil Pollutants, Radioactive; D011005:Plutonium