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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, while 239+240Pu activities increased with decreasing particle size. A spherical model could well simulate 239+240Pu...
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