radioactive warning sign

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