Inoue Kazumasa, Shimizu Hideo, Tsuruoka Hiroshi, Veerasamy Nimelan, Somboon Siriprapa, Nozawa Hitoshi, Fukushi Masahiro
Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, Japan.
Department of Radiological Sciences, Tsukuba International University, 6-20-1 Manabe, Tsuchiura, Ibaraki, Japan.
Radiat Prot Dosimetry. 2018 Dec 1;182(3):335-344. doi: 10.1093/rpd/ncy070.
Car-borne surveys were carried out on eight islands of the Izu Islands located 339-570 km southwest of the Fukushima Daiichi Nuclear Power Plant. The mean dose rates measured in 2015, 2016 or 2017 on each island were from 12 to 47 nGy h-1, meaning that the contribution ratios of artificial radionuclides were 5-31%. Based on the environmental half-life for long half-life radionuclides (134Cs + 137Cs) measured on Izu-Oshima (3.1 y), the mean dose rates in March 2011 were estimated to be 15-53 nGy h-1 and the contribution ratios of artificial radionuclides were 11-55%. The estimated annual external effective doses were 0.06-0.21 mSv which were 13-44% of the worldwide average (0.48 mSv).
在位于福岛第一核电站西南339 - 570公里处的伊豆诸岛的八个岛屿上进行了车载调查。2015年、2016年或2017年在每个岛屿上测量的平均剂量率为12至47纳戈瑞每小时，这意味着人工放射性核素的贡献率为5%至31%。根据在大岛测量的长半衰期放射性核素（134铯 + 137铯）的环境半衰期（3.1年），估计2011年3月的平均剂量率为15至53纳戈瑞每小时，人工放射性核素的贡献率为11%至55%。估计的年度外部有效剂量为0.06至0.21毫希沃特，占全球平均水平（0.48毫希沃特）的13%至44%。
