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The Goiânia accident refers to a serious radiation exposure incident that occurred in Goiânia, Brazil, in September 1987. It involved the accidental release of radioactive cesium-137 from a medical radiotherapy source that was improperly disposed of from an old medical clinic. Here’s a brief overview of the event: 1. **Source of Radiation**: The radioactive source was contained in a teletherapy unit that had been abandoned.