Word: radon
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Dates: during 1960-1969
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...cause seemed clear: radon, a dense gas that emanates from uranium, is highly radioactive and breaks down into products that are radioactive too. If there are more than 300 micromicrocuries of radioactive material per liter of air in a mine, the mine is officially rated unsafe. Investigators found air in 50% of the uranium mines in Colorado and Arizona contaminated by four to five times the safe level of radiation. In one mine, they counted 47,000 micromicrocuries per liter...