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The report indicated radiation levels at 13.9 millirems per hour where the buckets were stored, and 800 per hour on contact with the ore.
Just five feet from the buckets, there was a zero reading.
Lacking protective clothing, they purchased dish-washing and gardening gloves, then used a broken mop handle to lift the buckets into a truck, Stephenson said.
Those details are corroborated by photographs Stephenson included in a 45-page slideshow created to document the radiation exposure and alleged cover-up.
In his letter to colleagues, Stephenson apologized for the untimely notice.
He said he pressed park superintendents to take action, submitted an Inspector General complaint, contacted the FBI, and wrote to every member of Congress.
"If you were in the Museum Collections Building (2C) between the year 2000 and June 18, 2018, you were 'exposed' to uranium by OSHA's definition," Stephenson wrote.
"The radiation readings, at first blush, exceeds (.
Stephenson said technicians concealed the radiation readings from him and dumped the ore into Orphan Mine, an old uranium dig that is considered a potential Superfund site below the Rim, about two miles from Grand Canyon Village.
Stephenson said he drove to Phoenix in November and filed a report with OSHA, which sent inspectors to the museum building in yellow protective suits.