Lol Pakistan lost some material, then took an add out in the local newspaper.
akistan's nuclear authority has said there is no cause for concern after it published press adverts for information on "lost" radioactive material.
The adverts urged members of the public to inform officials if they found any "lost or stolen" radioactive material.
They were published in major Urdu-language newspapers in Pakistan.
A spokesman for the nuclear authority said that there was a "very remote chance" that nuclear materials imported 40-50 years ago were unaccounted for.
International concern over the safety of Pakistan's nuclear programme was expressed in 2004, when the country's top nuclear scientist, AQ Khan, confessed to leaking secrets to Iran, North Korea and Libya.
Dr Khan was subsequently placed under virtual house arrest, and is now suffering from pancreatic cancer.