1950s
- March, 1957 - No INES level - Houston, Texas, USA - Exposure of workers
- Two employees of a company licensed by the U.S. Atomic Energy Commission to encapsulate sources for radiographic cameras received radiation burns after being exposed to Ir192(Iridium-192) powder. The incident was reported in Look Magazine in 1961, but investigations published by the Mayo Clinic that same year found few of the radiological injuries claimed in widespread press reports.
Read more about this topic: List Of Civilian Radiation Accidents