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タイトル福島第一原子力発電所周辺のかく乱の少ない場所における放射性セシウムの土壌沈着量と空間線量率; 事故後5年間の経時変化
翻訳タイトルThe Deposition densities of radiocesium and the air dose rates in undisturbed fields around the Fukushima Dai-ichi nuclear power plant; Their temporal changes for five years after the accident
情報提供機関Elsevier
著者三上 智
著者田中 博幸
著者松田 秀夫
著者佐藤 昭二
著者星出 好史
著者奥田 直敏
著者鈴木 健夫
著者坂本 隆一
著者安藤 正樹
著者斎藤 公明
掲載日2019-12
言語eng
ページ数105941\_1p.-105941\_12p.
種別report
内容記述The deposition densities of radiocesium and the air dose rates were repeatedly measured in a large number of undisturbed fields within the 80km zone that surrounds the Fukushima Dai-ichi Nuclear Power Plant site between 2011 and 2016, and features of their temporal changes were clarified. The average air dose rate excluding background radiation in this zone decreased to about 20% of the initial value during the period from June 2011 to August 2016, which was essentially a result of the radioactive decay of 134Cs with a half-life of 2.06y. The air dose rate reduction was faster than that expected from the decay of radiocesium by a factor of about two, with most of this reduction being attributed to the penetration of radiocesium into the soil. The average deposition densities of 134Cs and 137Cs in fields that were not decontaminated were found to have decreased nearly according to their expected radioactive decay, which indicated that the movement of radiocesium in the horizontal direction was relatively small. The effect of decontamination was apparently observed in the measurements of air dose rates and deposition densities. Nominally, the average air dose rates in the measurement locations were reduced by about 20% by decontamination and other human activities, of which accurate quantitative analysis is and continue to be a challenge.
情報源JOPSS関連URL関連URL
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基礎・基盤研究全体マップ(2022)
URIhttps://f-archive.jaea.go.jp/dspace/handle/faa/211331