1. 1) Fukushima Prefecture (2014) Fukushima prefecture radioactivity measurement map. http://fukushima-radioactivity.jp/pc/. Accessed March 16, 2018.
2. 2) Prime Minister of Japan and his Cabinet (2011) Information related to Fukushima nuclear power plant and radioactivity. https://www.kantei.go.jp/saigai/genpatsu_houshanou.html. Accessed March 16, 2018.
3. 3) Prime Minister of Japan and his Cabinet (2011) The direction about designation of “high alert zone.” http://www.kantei.go.jp/saigai/pdf/20110421110001shiji.pdf. Accessed March 16, 2018.
4. 4) Kakamu T, Kanda H, Tsuji M, Hayakawa T, Fukushima T (2012) [Effects of the great East Japan earthquake on industries and laborers in Fukushima prefecture]. Sangyo Eiseigaku Zasshi 54, 37 (in Japanese).
5. 5) Ministry of Environment (2013) Annual report on the Environment, the Sound Material-Cycle Society and the Biodiversity in Japan 2013. http://www.env.go.jp/policy/hakusyo/h25/index.html. Accessed March 16, 2018.