1. [4] http://www.kenmukyou.gr.jp/f_souti.htm
2. [6] http://www.tepco.co.jp/nu/fukushima-np/f1/surveymap/images/f1-sv-20110323-j.pdf
3. [7] http://www.tepco.co.jp/nu/fukushima-np/f1/images/f1-sv3-20130322-j.pdf
4. [9] https://roboticstaskforce.files.wordpress.com/2011/05/20110427-rcpt-radiation.pdf