tritium. radioactive glow. gaseous tritium light source in a glass vial. radiation sign. green glow hazards to employees

alert atom atomic biohazard bomb chemical weapons container contamination danger dangerous disaster ecology energy environment glow green hazard hazardous industry irradiation liquid nuclear power pictogram poison pollution radiation radioactive radioactivity reactor restricted risk safety sign storage substance symbol toxic tritium uranium utilization warning waste yellow tritium glow gaseous light source glass vial sign hazards employees visitors inspectors irradiated zone luminous fluorescence phosphorescence