(237)Np and (241)Am as Fingerprints in the Major River Basins of Southern China and North South China Sea: A Land-Sea Perspective.
(237)Np and (241)Am as Fingerprints in the Major River Basins of Southern China and North South China Sea: A Land-Sea Perspective.
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(237)Np 和 (241)Am 作为中国南部和南海北部主要河流流域的指纹：陆海视角。
DOI：
10.1021/acsomega.1c03152
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发表时间：
2021-10-19
期刊：
影响因子：
4.1
通讯作者：
Liu Z
中科院分区：
文献类型：
--
作者：
Han X;Zhu J;Zhu Y;Li G;Liu Z
在全球核武器试验期间，大量放射性元素被释放到环境中。Np、Pu和Am等长周期锕系元素在不同环境中表现出不同的行为，其同位素特征指纹对研究放射性污染物的分布、迁移和预测具有重要意义。为研究241 Am和237 Np在华南地区的分布，（0.008 ± 0.012-0.932 ± 0.066 Bq/kg）和237 Np（0.037 ± 0.003-1.458 ± 0.063 mBq/kg），237 Np/239 Pu原子比首次分析了南海北方及主要流域95个表层沉积物样品中241 Am/239+ 240 Pu活度比值（0.033 ± 0.075-15.870 ± 0.477）和241 Am/239+ 240 Pu活度比值（0.055 ± 0.003-0.864 ± 0.054）。由于Am和Pu的清除机制不同，241 Am优先通过沉降颗粒物富集，而Pu则在近岸区域被清除，导致河口和近岸区域241 Am/239+ 240 Pu活度比值较高。237 Np的空间分布具有明显的不均匀性，迁移速率较高。相关指纹特征发生了很大变化，急需更新。241 Am、239、240 Pu和237 Np是海陆交汇的产物，以陆源沉积物为主，沉积在我国南方沿海地区，应引起重视。这项工作可以建立中国目前的镎放射性数据库，Np，Pu和Am清除过程的差异可能是一个强有力的工具，评估珠江口咸潮的影响。
During the global nuclear weapon tests, large amounts of radioactive elements are released into the environment. Long-period actinide elements such as Np, Pu, and Am exhibit different behaviors in various environments, and their isotope characteristic fingerprints are of great significance for studying the distribution, migration, and prediction of radioactive pollutants. To investigate the distribution of 241Am and 237Np in southern China, activities of 241Am (0.008 ± 0.012–0.932 ± 0.066 Bq/kg) and 237Np (0.037 ± 0.003–1.458 ± 0.063 mBq/kg), 237Np/239Pu atom ratios (0.055 ± 0.003–0.864 ± 0.054), and 241Am/239+240Pu activity ratios (0.033 ± 0.075–15.870 ± 0.477) in 95 surface sediment samples collected from the northern South China Sea and major river basins were analyzed for the first time. Due to the different scavenging mechanisms of Am and Pu, 241Am is preferentially concentrated by sinking the particulate, while plutonium is scavenged in the coastal area, resulting in a higher 241Am/239+240Pu activity ratio in estuary and coastal areas. The distribution of 237Np shows obvious spatial inhomogeneity as the high migration rate. The relevant fingerprint characteristic has changed greatly and needs to be updated urgently. As a result of the convergence of land and sea, 241Am, 239,240Pu, and 237Np are dominated by terrestrial sediments and deposited in the coastal area of southern China, which should be paid more attention to. This work can establish China’s current neptunium radioactivity database, and the difference in Np, Pu, and Am scavenging processes may be a powerful tool for evaluating the impact of the Pearl River Estuary salt tide.
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影响因子：
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