The Federal Customs Service said in a statement that found 18 pieces of metal at Moscow's Sheremetyevo airport after a radiation alert went on. It says the gauges showed that radiation levels were 20 times higher than normal.It was not immediately clear if the substance could have any use in Iran's controversial nuclear program.The pieces contained Sodium22, she said, a radioactive isotope of sodium that could be produced in a particle accelerator. Sodium22 is a positron-emitting isotope that has medical uses, including in nuclear medicine imaging.Grebenkina said prosecutors have launched a probe into the incident.
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