It is also not used in reactors as a component of fuel , he said . A nuclear expert says the material can not be used for weapons . Russian customs agency says the radioactive material can be obtained from a nuclear reactor . Comment: Russia 's atomic agency says the material is used only for scientific research .
A nuclear expert says the material can not be used for weapons . Russian customs agency says the radioactive material can be obtained from a nuclear reactor . Comment: Russia 's atomic agency says the material is used only for scientific research .