Russia's Federal Customs Service made the discovery, recently but on an unspecified day, after the material triggered an alarm in the airport's radiation control system.
A search of the luggage revealed 18 pieces of radioactive metal packed in individual steel casings.
The service said that tests showed the material was a radioactive isotope which could be obtained only 'as a result of a nuclear reactor's operations'.
Radiation levels in the area were 20 times above normal. An airport customs spokesman said the material had been identified as sodium-22, which can be used in medical equipment, but gave no other details. Read More