• 标题：Vertical distribution of Pu in forest soil in Qinghai-Tibet Plateau
• 关键词：Heavy metal; Pu isotope; Qinghai; Radionuclide; Vertical profile.
• 作者：

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The 239+240 Pu and 137 Cs activities and 240 Pu/ 239 Pu atom ratios in surface soil and soil core collected from Qinghai-Tibet Plateau were investigated. The maximum of 239+240 Pu and 137 Cs activity concentrations in five soil cores were found in upper layers and have a same trend: the maximum followed by exponential decline. The 240 Pu/ 239 Pu atom ratio ranged from 0.160 ± 0.009 to 0.212 ± 0.012, clarified that the plutonium mainly came from the global fallout and the contribution of Lop Nor test sites was negligible. In addition, the vertical profiles of radionuclides ( 210 Pb, 238 U, 232 Th, 226 Ra, 40 K) have been studied and a high correlation has been found between them. The correlations of Pu between organic matter (OM) and heavy metals were also studied. Person Correlation Coefficients revealed Pu had significant positive correlations with organic matter and Cd, Cu, Co, Zn, but negative correlation with Tl. The results have important implication for further understanding of the sources, records and environmental impacts of global and regional nuclear activities, which expanded the database of Pu activity level and atom ratio in Chinese soil and established a foundation for future environmental risk assessment.