Pu isotopes in soils collected downwind from Lop Nor: regional fallout vs. global fallout.
Pu isotopes in soils collected downwind from Lop Nor: regional fallout vs. global fallout.
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从罗布泊顺风收集的土壤中的钚同位素：区域沉降物与全球沉降物
DOI：
10.1038/srep12262
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发表时间：
2015-07-17
影响因子：
4.6
通讯作者：
Uchida S
中科院分区：
文献类型：
--
作者：
Bu W;Ni Y;Guo Q;Zheng J;Uchida S
首次对酒泉地区土芯样品进行了钚同位素分析，用于放射性源识别和放射性评价。酒泉地区位于罗布泊中国核试验场的下风处。大多数取样地点的高钚库存（13至546 Bq/m2）表明，该地区受到碳纳米管区域沉降物钚的非均匀污染。在大多数情况下，碳纳米管对土壤中总钚的贡献估计超过40%。土壤中240 Pu/239 Pu的原子比为0.059 ~ 0.186，库存加权平均值为0.158，略低于全球沉降物的比例。该原子比可以被认为是来自CNT的Pu的混合指纹。此外，酒泉地区土壤中钚的向下迁移速率比国内其他地区快。
For the first time, soil core samples from the Jiuquan region have been analyzed for Pu isotopes for radioactive source identification and radiological assessment. The Jiuquan region is in downwind from the Lop Nor Chinese nuclear test (CNT) site. The high Pu inventories (13 to 546 Bq/m2) in most of the sampling locations revealed that this region was heterogeneously contaminated by the regional fallout Pu from the CNTs. The contributions of the CNTs to the total Pu in soils were estimated to be more than 40% in most cases. The240Pu/239Pu atom ratios in the soils ranged from 0.059 to 0.186 with an inventory-weighted average of 0.158, slightly lower than that of global fallout. This atom ratio could be considered as a mixed fingerprint of Pu from the CNTs. In addition, Pu in soils of Jiuquan region had a faster downward migration rate compared with other investigated places in China.