北部湾（南海）中钚的空间分布、来源识别和输运路径。
Spatial distribution, source identification, and transportation paths of plutonium in the Beibu Gulf, South China Sea.
机构信息
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, China.
State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Centre of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, China.
出版信息
Mar Pollut Bull. 2024 Feb;199:115972. doi: 10.1016/j.marpolbul.2023.115972. Epub 2023 Dec 27.
To investigate the spatial distribution and source of plutonium isotopes in the Beibu Gulf, surface sediments were collected and analyzed using sector field inductively coupled plasma mass spectrometry (SF-ICP-MS). The activities of Pu in surface sediments ranged from 0.012 to 0.451 mBq/g (mean: 0.171 ± 0.138 mBq/g, n = 36), indicating a decreasing trend in a counterclockwise direction from the southern bay mouth. The counterclockwise decreasing trend in the south of the bay mouth is similar to the current in the Beibu Gulf. The Pu/Pu atom ratios in surface sediments ranged from 0.156 to 0.283 (mean: 0.236 ± 0.031, n = 36), slightly higher than that of the global fallout value of 0.18. This suggests that the Pu in the Beibu Gulf was a combination of global fallout and Pacific Proving Ground (PPG). The average contribution of the plutonium (Pu) derived from the PPG in the sediment was estimated to be 52 % ± 24 %.
为了研究北部湾中钚同位素的空间分布和来源，使用扇形场电感耦合等离子体质谱法（SF-ICP-MS）采集并分析了表层沉积物。表层沉积物中钚的活度范围为 0.012 至 0.451mBq/g（平均值：0.171 ± 0.138mBq/g，n=36），表明从湾口的南部呈逆时针方向递减。湾口南部的逆时针递减趋势与北部湾的海流相似。表层沉积物中的 Pu/Pu 原子比范围为 0.156 至 0.283（平均值：0.236 ± 0.031，n=36），略高于全球沉降值 0.18。这表明北部湾中的钚是全球沉降物和太平洋核试验场（PPG）的混合物。据估计，沉积物中源自太平洋核试验场的钚（Pu）的平均贡献率为 52%±24%。
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