对剂量系数的环境放射性参数的表征 - 与流行病学剂量计模型相比,现实的剂量计
Amin Shahrokhi1, Tibor Kovács1
1Department of Radiochemistry and Radioecology, Research Centre for Biochemical, Environmental and Chemical Engineering, University of Pannonia, 8200, Veszprém, Hungary.
Heliyon
|October 9, 2023
概括
在地下工作场所降低子度可能不会像预期的那样降低辐射暴露. 现实的剂量估计,使用更新的因子,显示剂量明显高于以前建模,突出需要修订的自然辐射源数据.
科学领域:
- 环境科学 环境科学
- 辐射保护 辐射保护
- 职业健康 职业健康 职业健康
背景情况:
- 自然背景辐射对每年的辐射暴露有很大的贡献.
- 国际辐射保护委员会 (ICRP) 最近更新的剂量系数因子可能会增加来自自然来源的估计剂量.
- 拉登对自然来源总剂量的贡献可能会增加.
研究的目的:
- 评估地下工作场所降低子度是否符合建议的辐射暴露水平.
- 调查流行病学剂量计模型与暴露现实的剂量估计之间的差异.
- 评估ICRP更新的剂量转换因子对职业辐射剂量的影响.
主要方法:
- 计算实际剂量转换因子 (DCF) 使用测量的年平均不连接分数和平衡因子.
- 使用自计算的DCF和ICRP-137推值估计的吸入剂量.
- 将估计的剂量与推值和从流行病学剂量计模型中得出的剂量进行比较.
主要成果:
- 暴露于低于推水平的子度并不能保证剂量低于推值.
- 使用自计算的DCF估计的吸入剂量明显高 (5.67.6 mSv y−1) 与ICRP-137值 (3.33.6 mSv y−1) 相比.
- 在本案例研究中,现实的剂量估计至少是流行病学剂量计模型的两倍.
结论:
- 将子度降低到推水平可能不足以缓解地下工作场所的辐射暴露问题.
- 当前的流行病学剂量计模型可能低估了暴露的实际辐射剂量.
- 需要对各种地下环境进行进一步的研究,ICRP关于自然辐射源贡献的数据可能需要更新,因为的影响增加.
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