1. Simulation of atmospheric dispersion of the radioactive plume formed by releases from the Fukushima Daiichi nuclear power plant since 12 March, Institut de Radioprotection et de Sûreté Nucléaire, France, March 19, 2011, http://www.irsn.fr/EN/newsroom/news/Documents/irsn-simulation-dispersion-en.pdf.
2. Monitoring information of environmental radioactivity level, Ministry of Education, Culture, Sports, Science and Technology, http://radioactivity.nsr.go.jp/ja/contents/5000/4858/24/1305819_0708.pdf, p4.
3. Monitoring information of environmental radioactivity level, Ministry of Education, Culture, Sports, Science and Technology, http://radioactivity.nsr.go.jp/ja/contents/7000/6749/24/191_258_0301_18.pdf, p6.
4. ICRP, 2007. The 2007 Recommendations of the International Commission on Radiological Protection. ICRP Publication 103. Ann. ICRP 37 (2–4).