基于使用LASSO回归和KURAMA数据的生态半衰期概况的环境剂量等效率分布的预测模型的开发
Yoshiaki Shikaze1, Kimiaki Saito2, Naoki Tanimura3
1Nuclear Emergency Assistance and Training Center, Nuclear Safety and Emergency Preparedness Institute, Japan Atomic Energy Agency, 178-4-4 Wakashiba, Kashiwa, Chiba 227-0871, Japan.
Radiation protection dosimetry
|July 24, 2025
概括
两组件模型通常很适合福岛空气剂量速率衰变,但更简单的模型在约20%的情况下更好. 生态半衰期因土地使用和初始剂量率而异.
科学领域:
- 环境科学 环境科学
- 辐射保护 辐射保护
- 核安全问题 核安全问题
背景情况:
- 两组件模型通常用于描述核事故后空气剂量速率 (ADR) 衰减.
- 验证该模型的充分性和了解生态半衰期对于准确的污染评估至关重要.
研究的目的:
- 评估福岛ADR衰变的两个组件模型的充分性.
- 为了研究放射性在不同土地使用类型中的生态半衰期概况.
- 评估初始ADR对衰变速率的影响.
主要方法:
- 从福岛第一核电站事故 (2011-2016) 获得的广泛的汽车运输调查数据的分析.
- 应用最小绝对收缩和选择操作员 (LASSO) 回归与高自由度模型.
- 对ADR衰变配件的一组件和两组件模型的比较.
- 为未来的ADR分配开发和验证一个预测模型.
主要成果:
- 在大多数福岛病例中,双组件模型充分近似了ADR衰变,但在约20%的病例中,单组件模型优越.
- 快速衰变组件的生态半衰期达到1年 (0.3-0.4年) 以下,而缓慢衰变组件的峰值更为广泛 (几年至50年).
- 城市地区的ADR降低速度最快,森林的ADR降低速度最慢,由于快速衰变成分的影响,更快的衰变与更高的初始ADR相关.
结论:
- 两组件模型通常适合,但对于福岛的ADR衰变分析并不普遍最佳.
- 生态半衰期的概况取决于土地使用情况,并受到初始污染水平的影响.
- 结合这些因素的预测模型显示出很好的准确性,但突出了道路通道区域和森林之间的衰变率差异.
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