by around 11 percent Radiation Effects Research Foundation a 200 mSv dose http://www.rerf.jp/radefx/late_e/cancrisk.html joint study http://www.rerf.jp/radefx/late_e/cancrisk.html ”Solid cancer risks among atomic-bomb survivors” ”Solid cancer risks among atomic-bomb survivors” joint study http://www.rerf.jp/radefx/late_e/cancrisk.html