http://www.nrc.gov/reading-rm/doc-collections/cfr/part020/
http://www.nrc.gov/reading-rm/doc-collections/fact-sheets/tritium-radiation-fs.html
http://www.nema.ne.gov/technological/dose-limits.html
http://www.deq.idaho.gov/inl_oversight/radiation/dose_calculator.cfm
http://www.deq.idaho.gov/inl_oversight/radiation/radiation_guide.cfm
http://mitnse.com/
http://www.mext.go.jp/component/a_menu/other/detail/__icsFiles/afieldfile/2011/03/18/1303727_1716.pdf
http://blog.vornaskotti.com/2010/07/15/into-the-zone-chernobyl-pripyat/
http://dels-old.nas.edu/dels/rpt_briefs/rerf_final.pdf
http://en.wikipedia.org/wiki/Sievert
http://radiology.rsna.org/content/248/1/254
http://webcache.googleusercontent.com/search?q=cache:BK-ukkJ_Fh0J:www.mext.go.jp/english/radioactivity_level/detail/1304853.htm+http://www.mext.go.jp/english/radioactivity_level/detail/1304853.htm&cd=1&hl=en&ct=clnk&gl=us&source=www.google.com
http://chottomatte.net/2011/03/16/tokyo-radiation-levels-daily-updates/