Colorado, USA – contamination Radium mining and manufacturing left a number of streets in the state's capital and largest city of Denver contaminated. 1927–1930 – No INES level – USA – radium poisoning Eben Byers ingested almost 1400 bottles of Radithor, a radioactive patent medicine, leading to his death in 1932. He is buried in Allegheny Cemetery in Pittsburgh, Pennsylvania, in a lead-lined coffin. 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 192Ir 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. 10 October 1957 – Windscale fire at the facility in Cumberland, Northern England (now Sellafield, Cumbria), UK. It is amongst the world's worst incidents, rated 5 on the International Nuclear Event Scale, lasted for 3 days, spreading significant quantities of radioactive isotopes across UK and Europe. 2 July 1956 - Sylvania Electric Products explosion in Queens, New York City. Explosions of thorium slugs resulted in the death by toxic heavy metal poisoning of one plant employee. June, 1958 – Y-12 National Security Complex criticality incident – Eight workers injured in the incident. 1960s In the 1962 Mexico City radiation accident, a boy found a 5 Curie Co-60 lost source in Mexico City and brought it home. Prolonged exposure to the source caused the death of the boy and three other members of the family 1970s 1975 – Brescia, Italy, at a cereal irradiation facility with four Cobalt-60 sources, a worker entered the irradiation room by climbing onto the conveyor belt. His first symptoms of exposure (nausea, vomiting, headache and erythema) were attributed to insecticides. For more than two days, his exposure to an unshielded 500 TBq source remained unknown to the physicians. He died 13 days after exposure; his whole body dose was evaluated at 12 Gy, non-uniform. 1977 – Dounreay, United Kingdom – release of nuclear material An explosion at the Dounreay Nuclear Power Development Establishment caused a mixture of unrecorded waste to be leaked from a waste disposal shaft. July 13, 1978 – Institute for High Energy Physics in Protvino, Russia – Anatoli Bugorski survives high-energy proton beam from a particle accelerator