@article{oai:tokyo-metro-u.repo.nii.ac.jp:00004895,
 author = {Hosokawa, Shota and Inoue, Kazumasa and Hashimoto, Kai and Yazawa, Yusuke and Hori, Kenta and Sugino, Masato and Fukushi, Masahiro},
 issue = {1},
 journal = {診療放射線学教育学, Japanese Journal of Education for Radiological Technology},
 month = {},
 note = {No detailed ambient dose rate has been reported, either before or after the Fukushima Daiichi Nuclear Power Plant (F1-NPP) accident, for Mikurashima Island, one of the islands within the authority of the Tokyo Metropolitan Government. Thus, the ambient dose rate on Mikurashima Island was observed 4.5 years after the F1-NPP accident. A car-borne survey and a foot patrol survey of the ambient dose rates were conducted over the entire island using a 3-in × 3-in NaI(Tl) scintillation spectrometer. The average ambient dose rate was 27 nGy h^-1 (12 – 45 nGy h^-1) and a higher dose distribution was observed for the northern and eastern areas of Mikurashima Island. However, the impact from the F1-NPP accident (i.e., the presence of artificial radionuclides) was mainly observed for the mountain area of the island (4 – 9 nGy h^-1; located about the center to south-southeast direction). Based on the measured ambient dose rate, the estimated annual effective dose after the accident was 0.09 mSv y^-1.},
 pages = {1--6},
 title = {Ambient dose rate in Mikurashima Island after the Fukushima Daiichi Nuclear Power Plant accident},
 volume = {4},
 year = {2016}
}