在日本福岛东部的几个河水中,核事故衍生的129I,2016-2020年
Shinji Ueda1, Hidenao Hasegawa1, Yoshihito Ohtsuka1
1Department of Radioecology, Institute for Environmental Sciences, 1-7 Rokkasho, 039-3212, Aomori, Japan.
Journal of environmental radioactivity
|January 13, 2025
概括
福岛东部河流中的溶解-129 (129I) 含量在2016-2020年期间仍然很高,几乎没有下降. 河水129I度与流域污染密度相关,表明长期释放潜力.
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.
- 核化学 核化学 核化学
背景情况:
- 福岛第一核电站事故释放了放射性核素,包括-129 (129I),进入环境.
- 了解129I在河流系统中的长期行为对于环境影响评估至关重要.
研究的目的:
- 从2016年到2020年在基流条件下测量福岛东部河流中溶解的129I度.
- 调查河水中的129I水平与流域污染密度之间的关系.
- 评估事故后129I在河流系统中的时间趋势和持久性.
主要方法:
- 在2016年至2020年期间,从福岛东部的11条河流收集和分析河水样本.
- 使用已确定的放射化学技术测量溶解的129I度.
- 统计分析以确定129I度与流域污染密度之间的相关性.
主要成果:
- 溶解的129I度有很大的差异,从1.2 × 10−7 Bq L−1到1.6 × 10−6 Bq L−1.1.
- 诸如Ukedo,Niida-U和Nagadoro这样的河流显示了福岛事故对129I的影响.
- 在河水中的129I度与流域中的平均129I污染密度之间观察到强烈的正相关性.
- 在研究期间,129I度的时间变化很小,并且没有明显的年比年下降.
结论:
- 溶解的129I在福岛东部的河流中持续存在,其度与流域污染有关.
- 观察到的缺乏下降表明,从受污染的地区持续,长期的129I流出.
- 需要进一步监测,以了解长期环境命运和与持续的129I污染相关的潜在风险.
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