man hand use dosimeter of radioactive radiation next to an old pocket watch with dangerous fluorescent paint. violet light and

danger radioactive radiation chernobyl nuclear dosimeter man area device atomic environment pollution toxic hazard disaster monitoring military environmental radiometer destruction dosimetr boy american protective equipment decay dosimetrist soldier hazardous dosimetric catastrophe radiological male urban background handsome warning counter mask protection sign wall contaminated survey control teenager teen ecology contamination watch hand use next old pocket dangerous fluorescent paint violet light green glow numbers dosimetry search objects