Boulder, Colo. (AP) Government officials have ordered a federal laboratory to stop using radioactive materials until it can show its procedures are safe after a plutonium spill.
The Boulder Daily Camera reports that the commission said Wednesday such stop orders are rare.
A vial cracked June 9th at the national Institute Of Standards And Technology Lab. About one-fourth of a gram of powder containing plutonium spilled.
Institute officials have said a few employees had internal plutonium exposure and were being treated.
Officials say radiation was found in two buildings and that internal plutonium exposure can lead to cancer.
Nuclear regulatory commission officials say no threats to public health or the environment have been identified.