Radiation Hazard Symbol - Meaning, History, and Safety Significance #191519 (License: Personal Use)

This image shows the standard ISO 361 radiation hazard symbol, also known as the trefoil, consisting of three equidistant orange blades spaced at 120 degrees around a central circle on a black background. Designed in 1946 at the University of California, Berkeley, it was adopted globally to warn of potentially dangerous levels of ionizing radiation from sources like nuclear reactors, medical isotopes, or contaminated materials. Its high-contrast color scheme ensures visibility and immediate recognition in emergency or industrial settings.

Used on signage, packaging, equipment, and documentation in nuclear facilities, hospitals (radiology/oncology), research labs, and transport containers for radioactive materials. Matches user intent for safety education, regulatory compliance, hazard identification, or academic reference.