著者

新井 正一 土居 亮介 久志野 彰寛 大沼 雅明

出版者

純真学園大学

雑誌

純真学園大学雑誌 = Journal of Junshin Gakuen University, Faculty of Health Sciences (ISSN:21866481)

巻号頁・発行日

no.5, pp.75-80, 2016-03

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要旨 : 2011年3月15日に発生した東日本大震災に伴う東京電力福島第一原子力発電所事故によって放射性物質が放出された. 震災後., 原発より南に20km離れた福島県双葉郡広野町において., 震災後1年目の2012年3月および3年半後の2014年8月にダストサンプラーを用いて空気中浮遊塵を収集し., その中に含まれる放射性物質を同定., 量を算出した. その結果., 2012年3月時点では134-Csが9.26×10-7 Bq/l ., 137-Csが2.42×10-7 Bq/l 含まれていた. この空気を吸った場合の内部被ばくを算出すると0.95 μSv/年 となった. 2014年8月時点ではこれら放射性セシウムは検出限界以下となった. 被ばくには内部被ばく., 外部被ばくの合算で評価されるが., 本研究結果および他の先行論文の結果も踏まえて., 福島住民の年間被ばく線量は1mSv以下になることが示唆された. Abstract : Radioactive substances were released due to the accident at the Tokyo Electric Power Company Fukushima Daiichi Nuclear Power Station in relation to the Great East Japan Earthquake occurred in March 2011. After the earthquake disaster, we collected drifting dust in the air by using dust samplers in Futabagun Hironomachi, Fukushima, about 20km south of the nuclear power plant in March 2012, which was one year after the earthquake disaster, and in August 2014, which was three and half years after the earthquake disaster, and identified and calculated the concentration of radioactive substances. As a result, 9.26×10-7 Bq/l of 134-Cs were included and 1.39×10-6 Bq/l of 137-Cs were included. When internal exposure was calculated in case of breathing this air, it was 0.95 μSv/year. As of August 2014, especially radioactive cesium among these radioactive substances was the below detection limit.Radiation exposure is evaluated by the total of internal and external exposures, and in consideration of the results of this research and the precedent researches, it was suggested that the annual radiation exposure level of the residents in Fukushima was below 1mSv.