福岛第一核电站事故后伊豆大岛空气中环境剂量率的自然变化。
Natural variation of ambient dose rate in the air of Izu-Oshima Island after the Fukushima Daiichi Nuclear Power Plant accident.
作者信息
Maedera Fumihiko, Inoue Kazumasa, Sugino Masato, Sano Ryosuke, Furue Mai, Shimizu Hideo, Tsuruoka Hiroshi, Le Van Tan, Fukushi Masahiro
机构信息
Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan.
Gunma Prefectural College of Health Sciences, 323-1 Kamioki-machi, Maebashi-shi, Gunma 371-0052, Japan.
出版信息
Radiat Prot Dosimetry. 2016 Mar;168(4):561-5. doi: 10.1093/rpd/ncv370. Epub 2015 Aug 5.
The ambient dose rate in air and radioactivity concentration in soil samples collected on Izu-Oshima Island were observed in 2012, 2013 and 2014, i.e. 1, 2 and 3 years after the severe accident at the Fukushima Daiichi Nuclear Power Plant. A car-borne survey for the ambient dose rate in air was carried out for the entire island. Soil samples were collected for the radioactivity concentration measurements from 22 points. The ambient dose rates in air were 36 nGy h(-1) in 2012, 34 nGy h(-1) in 2013 and 29 nGy h(-1) in 2014. The corresponding radioactivity concentrations in those years for (134)Cs were 53, 39 and 29 Bq kg(-1) and for (137)Cs, 87, 73 and 75 Bq kg(-1). All the values have decreased every year.
在2012年、2013年和2014年，即福岛第一核电站严重事故发生后的1年、2年和3年，对伊豆大岛采集的空气环境剂量率和土壤样本中的放射性浓度进行了观测。对全岛进行了车载空气环境剂量率调查。从22个点采集土壤样本进行放射性浓度测量。2012年空气环境剂量率为36 nGy h(-1)，2013年为34 nGy h(-1)，2014年为29 nGy h(-1)。这些年份中(134)Cs的相应放射性浓度分别为53、39和29 Bq kg(-1)，(137)Cs的相应放射性浓度分别为87、73和75 Bq kg(-1)。所有数值均逐年下降。
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