may 1, 1974 - 1974
May 18 - India sets off a low-yield device (8 kilotons) under Rajasthan desert.
July 3 - The Threshold Test Ban Treaty (TTBT) is signed in Moscow. It limits nuclear test explosions to under 150 kilotons.
November 24 - President Ford and General Secretary Brezhnev sign the Vladivostok Accord, agreeing to limit the number of strategic launchers (2400) and MIRV launchers (1320).
Added to timeline:
atomic and nuclear physics