2020年
Evaluation of decreasing trend in air dose rate and ecological half-life within an 80 km range from Fukushima Dai-ichi Nuclear Power Plant, using car-borne survey data measured by KURAMA systems up to 2018
Journal of Nuclear Science and Technology
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- 開始ページ
- 1
- 終了ページ
- 13
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1080/00223131.2020.1789008
© 2020, © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. Air dose rates within a range of 80 km from the Fukushima Dai-ichi Nuclear Power Plant measured via car-borne surveys using the KURAMA systems from 2011 to 2018 were analyzed. The ratio of the air dose rates relative to the first car-borne survey was 0.08 over a period of seven years, indicating a much more rapid decrease than that estimated by the physical decay of radiocesium (0.3). Differences in the decreasing trends of the air dose rates among the land-use categories and evacuation order areas were examined. The ecological half-lives were evaluated according to the land-use categories in each evacuation order area. To model the acceleration of the decrease in the air dose rates observed in the evacuation order area, we modified the bi-exponential curve formula of ecological half-life and introduced the two-group model. The ecological half-life of the fast components in the evacuation order area of ‘zone in preparation for the lifting of the evacuation order’ evaluated using the two-group model after 2013 were 0.5–1 y, which were much shorter than those before 2013 (2–3 y).
- リンク情報
- ID情報
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- DOI : 10.1080/00223131.2020.1789008
- ISSN : 0022-3131
- SCOPUS ID : 85087640295