福岛第一核电站事故后室外工作人员个人外部照射剂量和疏散有序区环境剂量率的统计评估。

IF 1.4 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
Motofumi Saisu, Tadahiko Ando, Keizo Uchiyama, Toshihiro Ueno, Koichi Takizawa, Yuji Endo, Kazuya Yoshimura, Yukihisa Sanada
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引用次数: 0

摘要

福岛第一核电站事故发生后,对周边社区发布了疏散令。为了解除疏散令,有必要确定疏散地区的个人体外剂量。本研究的目的是确定个人体外剂量与每小时环境剂量率之间的定量关系,并将其作为换算系数。更具体地说,我们对东京电力控股公司在难以返回区的员工的个人体外剂量进行了长期(2020 财年至 2022 财年)的广泛测量。为了获得高精度的估计值,我们不仅使用了基于机载辐射监测数据的环境剂量率,还使用了经过统计校正的综合剂量率图数据,以符合当地的地面环境剂量率梯度。因此,根据机载辐射监测所测得的环境剂量率图,撤离令解除区(ELZs)的换算系数为 0.42,重建和恢复特别区(SZRRs)的换算系数为 0.37,无重建和恢复特别区的难以返回区(DRZs)的换算系数为 0.47。另一方面,综合剂量率图是根据近年来政府项目研究的各种监测统计分析得出的高精度剂量率图,根据综合剂量率图得出的换算系数为:ELZs 为 0.78,SZRRs 为 0.72,DRZs 为 0.82。利用这些换算系数,可以根据政府提供的两张具有代表性的环境剂量率图估算出个人体外剂量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Statistical evaluation of individual external exposure dose of outdoor worker and ambient dose rate at evacuation ordered zones after the Fukushima Daiichi Nuclear Power Station accident.

Following the accident at the Fukushima Daiichi Nuclear Power Station, evacuation orders were issued for the surrounding communities. In order to lift the evacuation order, it is necessary to determine individual external doses in the evacuated areas. The purpose of this study was to determine the quantitative relationship between individual external doses and ambient dose rates per hour as conversion coefficients. More specifically, individual external doses of Tokyo Electric Power Company Holdings employees in difficult-to-return zone were measured broadly over a long period (fiscal year 2020 to fiscal year 2022). To obtain highly accurate estimates, we used not only ambient dose rates based on airborne radiological monitoring data, but also Integrated dose rate map data that had been statistically corrected to correspond to local ambient dose rate gradients on the ground. As a result, the conversion coefficients based on the ambient dose rate map measured by airborne radiological monitoring were 0.42 for the Evacuation-Order Lifted Zones (ELZs), 0.37 for the Special Zones for Reconstruction and Rehabilitation (SZRRs), and 0.47 for the Difficult-to-Return Zones without SZRRs (DRZs). On the other hand, the conversion coefficients based on the Integrated dose rate map which is a highly accurate dose rate map based on statistical analysis of various types of monitoring that have been studied in government projects in recent years, were 0.78 for the ELZs, 0.72 for the SZRRs and 0.82 for the DRZs. Using these conversion coefficients, the individual external dose can be estimated from two representative ambient dose rate maps provided by the government.

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来源期刊
Journal of Radiological Protection
Journal of Radiological Protection 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
2.60
自引率
26.70%
发文量
137
审稿时长
18-36 weeks
期刊介绍: Journal of Radiological Protection publishes articles on all aspects of radiological protection, including non-ionising as well as ionising radiations. Fields of interest range from research, development and theory to operational matters, education and training. The very wide spectrum of its topics includes: dosimetry, instrument development, specialized measuring techniques, epidemiology, biological effects (in vivo and in vitro) and risk and environmental impact assessments. The journal encourages publication of data and code as well as results.
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