41.   He refused to specify what the radioactive substance was, but said that there was no danger of radioactivity escaping outside the building.

42.   In addition, poor safety measures provide unauthorized people comparatively easy access to radioactive substances, he said.

43.   Intelligence officials from both nations have met to discuss how to stop illicit trade in radioactive substances.

44.   Internationally, there is a thriving black market in radioactive substances.

45.   It does admit the theft of radioactive substances from some facilities, including natural and low-enriched uranium, which it says are unsuitable for weapons production.

46.   It was the first discovered attempt to smuggle a radioactive substance this year.

47.   Moscow has denied any thefts of weapon-grade materials, but acknowledged that there have been many attempts to steal and smuggle other radioactive substances.

48.   Police said Friday they had detained two Czechs and a Pole suspected of smuggling huge amounts of deadly poison and potentially radioactive substances.

49.   Russian officials have said that no weapons-grade nuclear material have been stolen, but frequently reported thefts of radioactive substances.

50.   Smuggling and trade with radioactive substances has flourished in eastern Europe since the breakup of the former East bloc.