从加拿大采矿业务到淡水的-226的历史释放量
C L Proulx1, B W Kilgour2, R R Goulet3
1Department of Earth and Environmental Sciences, University of Ottawa, 150 Louis-Pasteur Private, Ottawa, ON, K1N 6N5, Canada; Kilgour & Associates Ltd., 2285 St. Laurent Blvd, Ottawa, ON, K1G 4Z6, Canada.
Journal of environmental radioactivity
|February 14, 2025
概括
矿山废水中的-226 (Ra-226) 排放不仅来自矿. 其他采矿部门,特别是有色金属,平均Ra-226度高于矿.
科学领域:
- 环境科学 环境科学
- 放射化学 放射化学是指辐射化学.
- 采矿工程 采矿工程 采矿工程
背景情况:
- -226 (Ra-226) 是一种天然存在的放射性同位素.
- 一个常见的误解是,Ra-226在水中的释放完全归因于矿开采.
- 在各种采矿部门的废水中对Ra-226进行监测.
研究的目的:
- 评估2014-2022年间加拿大矿山废水中的Ra-226排放量.
- 为了比较不同矿业部门的Ra-226度.
- 挑战对矿作为Ra-226释放的主要来源的看法.
主要方法:
- 使用了根据加拿大金属和钻石采矿废水条例报告的数据.
- 分析了Ra-226.6的最终处理废水度.
- 按采矿部门分组的数据:贵金属,普通金属,有色金属,非有色金属,矿石和钻石.
主要成果:
- 平均Ra-226度因行业而异,有色金属矿最高 (51.9 mBq/L),有色金属矿最低 (11.0 mBq/L).
- 非铁,普通金属,钻石和行业的Ra-226平均度超过了自然背景上限 (21.7 mBq/L).
- 所有行业的 Ra-226 度中位数都低于 UTL,这表明出现了偶发性释放.
结论:
- 矿开采通常比其他采矿部门的Ra-226废水度更低.
- 偶尔出现的高Ra-226释放可能与矿石体含量变化有关.
- 这项研究驳斥了这种观点,即矿作业是采矿废水中Ra-226的唯一或主要来源.
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