Uchiyama Keizo, Ishii Toshiaki, Koyabu Ken, Takizawa Koichi, Muto Shoichi
Decontamination Promotion Office, Fukushima Revitalization Headquarters, Tokyo Electric Power Company Holdings, Fukushima, Japan. Author to whom any correspondence should be addressed.
J Radiol Prot. 2020 Sep;40(3):667-691. doi: 10.1088/1361-6498/ab968e.
Since the accident at Fukushima Daiichi Nuclear Power Plant, individual external doses of residents have been investigated. To accurately analyse survey data, a variety of information, including the activity patterns of many residents, needs to be integrated. However, such large-scale surveys have not yet been conducted and actual individual external doses in Fukushima are unclear. In this study, the individual external doses of approximately 300 Tokyo Electric Power Company Holdings employees, who live and work in Fukushima Prefecture outside the Fukushima Daiichi Nuclear Power Plant, were measured. The employees carried GPS loggers and personal dosimeters capable of measuring dose in counts per minute. The employees' individual external doses were compared along with their activity patterns. It was found that the annual additional individual external dose estimated based upon actual measurements was 1 mSv or less, and the influence on the individual external dose was also revealed.
自福岛第一核电站事故以来，一直在对居民的个人外部剂量进行调查。为了准确分析调查数据，需要整合包括许多居民的活动模式在内的各种信息。然而，尚未进行如此大规模的调查，福岛实际的个人外部剂量尚不清楚。在本研究中，对约300名在福岛第一核电站以外的福岛县生活和工作的东京电力公司控股员工的个人外部剂量进行了测量。这些员工携带了GPS记录仪和能够以每分钟计数测量剂量的个人剂量计。将员工的个人外部剂量与其活动模式进行了比较。结果发现，根据实际测量估计的年度额外个人外部剂量为1毫希沃特或更低，同时还揭示了对个人外部剂量的影响。
