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在冰川小鼠和冰岛冰川中的冷石中的异常积累

Katarzyna Kołtonik¹, Kamil Wojciechowski¹, Dariusz Sala¹

¹Department of Mass Spectrometry, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland.

The Science of the total environment

|September 2, 2025

概括

这项研究测量了冰岛冰川小鼠和冷石中的人工和天然放射性物质,与之前的报告相比,发现水平略高. 冰川小鼠的放射性核酸度通常低于冷石,全球降落被确定为主要来源.

科学领域:

环境科学
放射化学
冰川学

背景情况:

冰川生态系统是环境变化和污染物运输的敏感指标.
了解这些环境中的放射性核酸分布对于评估生态风险至关重要.
冰岛的冰川拥有独特的生态系统,

研究的目的:

在冰岛冰川小鼠和冷石中全面调查人造 (137Cs,241Am,238Pu,239+240Pu) 和天然 (210Pb) 放射性物质.
为了比较冰川小鼠和冷石的放射性核酸度.
使用同位素比来确定检测到的放射性核酸的主要来源.

主要方法:

从五个冰岛冰川收集冰川小鼠和冷石样本.
使用玛光谱和α光谱测量137Cs,241Am,238Pu,239+240Pu和210Pb的活性度.
对同位素比率 (238Pu/239+240Pu,241Am/239+240Pu,240Pu/239Pu) 的分析以确定放射性核酸源.

主要成果:

冰川小鼠和冷石中的放射性核酸度略高于冰岛之前报告的水平.
冰川小鼠的最大活性度为137Cs达到了407±30 Bq kg-1和210Pb达到了2690±170 Bq kg-1.
137Cs的最大活性度达到了244±16 Bq kg-1和210Pb的最大活性度达到了3680±175 Bq kg-1.
与冷石相比,冰川老鼠的放射性核酸活性度通常较低.
同位素比表明全球降落是和同位素的主要来源.
与其他冰岛样本相比,观察到239+240Pu的含量较高,来源不明.

结论:

冰岩和冰川老鼠都参与冰岛冰川和前冰川生态系统中远程运输的污染物循环.
在这些样本中,全球降落是人工放射性核素 (Pu,Am) 的主要来源.
较高的239+240Pu含量需要进一步研究潜在的局部来源或传输机制.

关键词:

化石冰川小鼠全球辐射放射性核化物

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