title: Particle-size speciation of Pu isotopes in surface soils from Inner Mongolia (China) and its implications for Asian Dust monitoring.
abstract: To study the applications of Pu isotopes in long-distance dust migration monitoring, Pu isotopes in surface soil of Inner Mongolia have been analyzed using SF-ICP-MS after size fractionation.240Pu/239Pu atom ratios ranged narrowly (0.169-0.200) and indicated global fallout character, while239+240Pu activities increased with decreasing particle size. A spherical model could well simulate239+240Pu activities as a function of particle diameter when soil particle size was less than 600µm, and the soil particle surface sorption phenomenon of Pu isotopes in natural soil samples was revealed. Furthermore,239+240Pu activity in fine particles (sized less than 53µm) had good consistency with that in atmospheric depositions of Japan since the 2000s, suggesting new Asian Dust sources (i.e. central Inner Mongolia) other than the well-known Chinese deserts.
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Dong
authors.affiliation: Biospheric Assessment for Waste Disposal Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan. Electronic address: zheng.jian@qst.go.jp.
authors.forename: Jian
authors.initials: J
authors.lastname: Zheng
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
authors.forename: Qiuju
authors.initials: Q
authors.lastname: Guo
mesh_terms: D001208:Asia; D002681:China; D004391:Dust / Q000032:analysis; D006801:Humans; D007564:Japan; D010316:Particle Size; D011005:Plutonium / Q000032:analysis*; D011834:Radiation Monitoring; D011847:Radioactive Fallout / Q000032:analysis; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D004391:Dust; C000615188:Plutonium-240; D011847:Radioactive Fallout; D012990:Soil Pollutants, Radioactive; D011005:Plutonium; C000615187:Plutonium-239
keywords: Asian Dust; Global fallout; Inner Mongolia; Pu isotopes; Soil particle-size speciation