A highly radioactive material used to treat cancer is back on U.S. soil after American officials removed it from Guatemala over concerns it could be stolen and used to create a “dirty bomb.”

The cobalt-60 source had been housed inside a disused medical radiation device before U.S. and Guatemalan teams removed the radioactive component and transported it to secure storage in the United States.

The U.S. National Nuclear Security Administration (NNSA) announced the operation Thursday, saying it was part of a broader effort to prevent dangerous radioactive materials from falling into the hands of terrorists and other adversaries.

The operation…

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