Radiation monitoring and evaluation of exposure doses to lift the evacuation orders for the zones designated for reconstruction and recovery

Q4 Engineering
Y. Sanada, H. Kurikami, H. Funaki, K. Yoshimura, Tomohisa Abe, Mutsushi Ishida, S. Tanimori, R. Sato
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引用次数: 2

Abstract

The Japanese government is beginning to consider radiation protection in the “ specific reconstruc tion reproduction base area” of the Fukushima nuclear power plant, the evacuation order of which will be lifted by 2023. It is essential to grasp the present situation of radiation contamination and evaluate exposure dose in the area to realize the lifting of this evacuation order zone. Many surveys on the evaluation of the distributions of air dose rate have been carried out, and exposure dose has been esti-mated using the results since the Fukushima Daiichi Nuclear Power Plant accident. Nevertheless, more detailed information on exposure is needed for the area because the radiation level is relatively high. This will also be helpful in preparing a prudent evaluation plan. This study is aimed at evaluat-ing the detailed contamination situation in the area and estimating exposure dose with consideration of areal circumstances. Work was carried out for ( 1 ) an airborne survey of the air dose rate using an unmanned helicopter and ground-based measurement ( walk-survey ) , ( 2 ) the evaluation of airborne radiocesium and ( 3 ) the estimation of external / internal effective doses for the typical life patterns as-sumed. Our study resulted in a detailed map of the air dose rate and clarified the distribution pattern in the area. Moreover, the exposure dose of residents was evaluated by considering some life patterns based on this map.
对辐射进行监测和评估,以解除重建和恢复指定地区的疏散令
日本政府开始考虑在福岛核电站的“特定重建再生基地区域”进行辐射防护,该区域的疏散令将于2023年解除。要解除疏散令,必须掌握该区域的辐射污染现状,评估照射剂量。自福岛第一核电站事故以来,开展了许多评价空气剂量率分布的调查,并利用调查结果估算了辐照剂量。然而,由于辐射水平相对较高,需要对该地区的照射情况提供更详细的资料。这也将有助于制定审慎的评估计划。本研究的目的是评估该地区的详细污染情况,并考虑该地区的实际情况估计暴露剂量。开展了以下工作:(1)使用无人直升机和地面测量(步行测量)对空气剂量率进行空中调查;(2)对空气放射性铯进行评估;(3)对假设的典型生活模式进行外部/内部有效剂量估计。我们的研究得出了一张详细的空气剂量率图,并阐明了该地区的分布格局。在此基础上,结合居民的生活模式,对居民的暴露剂量进行了评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Transactions of the Atomic Energy Society of Japan
Transactions of the Atomic Energy Society of Japan Energy-Nuclear Energy and Engineering
CiteScore
0.50
自引率
0.00%
发文量
16
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