radioactive warning sign

font yellow line cartoon brand logo circle text diagram number signage advertising sign orange banner symbol radioactive warning three mile island nuclear accident windscale fire disaster kyshtym fukushima chernobyl chernobyl hisashi ouchi biohazard notice restricted industry atom plutonium contamination roentgen fission fusion industrial nuke x-ray waste poisonous warning hazardous radio risk radioisotope pollution uranium radioactive sign danger hazard safety radioactivity atomic reactor dangerous protection alert nuclear caution radiation