著者

三枝 博光 舟木 泰智 操上 広志 坂本 義昭 時澤 孝之

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.12, no.1, pp.1-12, 2013 (Released:2013-02-15)

参考文献数

6

被引用文献数

1

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Since the Fukushima Daiichi nuclear power plant accident caused by the Tohoku Region Pacific Coast Earthquake on March 11, 2011, decontamination work has been conducted in the surrounding environment within the Fukushima prefecture. Removed contaminants including soil, grass and trees are to be stored safely at temporary storage facilities for up to three years, after which they will be transferred to a planned interim storage facility. The decontamination pilot project was carried out in both the restricted and planned evacuation areas in order to assess decontamination methods and demonstrate measures for radiation protection of workers. Fourteen temporary storage facilities of different technical specifications were designed and constructed under various topographic conditions and land use. In order to support the design, construction and monitoring of temporary storage facilities for removed contaminants during the full-scale decontamination within the prefecture of Fukushima, technical know-how obtained during the decontamination pilot project has been identified and summarized in this paper.

著者

眞田 幸尚 操上 広志 舟木 泰智 吉村 和也 阿部 智久 石田 睦司 谷森 奏一郎 佐藤 里奈

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.20, no.2, pp.62-73, 2021 (Released:2021-06-01)

参考文献数

29

被引用文献数

1 4

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The Japanese government is beginning to consider radiation protection in the “specific reconstruction 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 estimated 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 evaluating 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 assumed. 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.