在冷石中降落放射性核酸的化学可用性
H Davidson1, G E Millward1, C C Clason2
1School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth, UK.
Journal of environmental radioactivity
|August 3, 2023
概括
冰川冷岩中的遗留下落放射性核素 (FRN) 可以释放到融水中,对下游环境和食物链构成风险. 了解来自冰川的FRN动员对于评估生态和健康影响至关重要.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 放射化学 放射化学是指辐射化学.
背景情况:
- 冰川积累了遗留下来的沉降放射性核素 (FRN) 在冷岩中,这是一种污染物结合材料.
- FRN可以通过融水从冰川中释放出来,影响下游生态系统.
- 融化冰川释放FRN的环境和健康风险尚未得到充分了解.
研究的目的:
- 为了评估吸附于冷矿的FRN的化学可用性和释放潜力.
- 调查从冰川冷岩石中特定FRN (-137,-210,美洲-241) 的差异溶解.
- 了解FRN动员对冰川依赖生态和食物链的影响.
主要方法:
- 对来自瑞典和冰岛冰川的冷石样本应用了三阶段的连续化学提取方法.
- 在冷岩中测量了137Cs,未支持的210Pb (210Pb un) 和241Am的活性度.
- 在化学提取过程中分析了FRN的逐步溶解和颗粒物保留.
主要成果:
- 吸附于冷矿的FRN表现出不同程度的溶解.
- 没有支持的210Pb (210Pb un) 显示出显著的阶段性溶解.
- 137Cs和241Am在提取过程中主要保留在颗粒阶段.
- 测量到的FRN活动度是区域背景以上的数量级.
结论:
- 在冰川环境中,冷石作为FRN的重要储存库.
- 冰川融化可能导致FRN污染颗粒的调动.
- FRN从冷岩的差异性释放对下游水生和陆生生态系统有影响.
- 需要进一步的研究,以充分了解与放射性污染的冰川融水相关的生态和人类健康风险.
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