By Will Stewart in Moscow
Last Updated: 2:24am GMT 04/01/2008
Russia has admitted that customs officials thwarted more than 120 attempts to smuggle "highly radioactive" material out of the country last year.
The disclosure is likely to fuel concern about how many illegal exports were not halted. It will also lead to new fears that Moscow has failed to stop material becoming available on the black market that could be used by terrorists to make radioactive "dirty" bombs.