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August 5, 1963: US, USSR, Britain Sign Limited Test Ban Treaty

1963-08-05

The US, the Soviet Union, and Great Britain sign the Limited Test Ban Treaty (LTBT) outlawing atmospheric nuclear tests as well as nuclear tests in outer space and underwater. Underground tests are also outlawed if they result in spreading radioactive debris outside the territorial limits of the country where the explosion is conducted. [Federation of American Scientists, 12/18/2007]