Nuclear security is priority for the UN nuclear watchdog agencyListen /
Governments around the world have been urged to ratify a treaty to ensure the security of nuclear material.
The appeal has come from Yukiya Amano, the head of the International Atomic Energy Agency (IAEA).
Mr. Amano addressed the General Conference of the IAEA which opened in Vienna on Monday.
He said the Amendment to the Convention on the Physical Protection of Nuclear Material was agreed in 2005 but it has still not entered into force.
"Entry into force of the amendment will make an important contribution, important difference to global nuclear security. Nuclear security is a priority for the agency. We are carefully examining ways of maximizing the synergy between nuclear security and nuclear safety. I plan to strengthen our office of nuclear security in the near future."
Mr. Amano said the IAEA will organize a high-level international conference on nuclear security in July 2013.