IAEA chief Muhammad el-Baradei (AFP)
July 29, 2007 -- The UN's International Atomic Energy Agency (IAEA) celebrated its 50th anniversary today.
In a congratulatory note, UN Secretary-General Ban Ki-moon said the IAEA "has strived to accelerate and expand its contributions to security and development."
The Vienna-based United Nations agency, which counts 144 member states, was set up in 1957 to ensure the peaceful use of nuclear energy.
In 2005, the IAEA and its head, Muhammad el-Baradei, received the Nobel Peace Prize for their work.