On 18 December 1970, the United States conducted the ‘Baneberry’ nuclear test at the Nevada Test Site. Although the explosion was set off 270 metres below the surface, a large cloud of radioactive dust was released into the atmosphere, affecting test site workers and spreading to other U.S. states.
http://www.ctbto.org/specials/infamous-anniversaries/18-december-1970-the-baneberry-incident/
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