Goiânia Accident, Brazil (1987)

The Goiânia accident stands as the worst radiological contamination event outside the nuclear industry, causing 4 deaths and contaminating 249 people—a death toll that surpasses the SL-1 reactor explosion's 3 fatalities. In September 1987, scavengers broke open an abandoned radiotherapy source containing 19 grams of cesium-137, fascinated by its eerie blue glow, leading to the demolition of several homes and evacuation of 200 residents at a cost of $20 million in cleanup. Compared to Windscale's indirect cancer risks, Goiânia delivered immediate, visible devastation, with the blue glow becoming a symbol of nuclear danger. The accident remains a benchmark for orphan source disasters worldwide.