Bomba čije se dejstvo ostvaruje atomskom eksplozijom, pri čemu se oslobađa ogromna količina energije vezane u atomskom jezgru, što izaziva strahovita razaranja i radioaktivno zračenje sa smrtonosnim posledicama za sva živa bića (lat.-fr.)
A nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element such as uranium 235 or plutonium 239); SYN. atomic bomb, A-bomb, fission bomb, plutonium bomb.
Bomb deriving its explosive force from nuclear fission (see nuclear energy) as a result of a neutron chain reaction, developed in the 1940s in the US into a usable weapon.
Research began in the UK 1940 and was transferred to the US after its entry into World War II the following year. Known as the Manhattan Project, the work was carried out under the direction of the US physicist Robert Oppenheimer at Los Alamos, New Mexico. After one test explosion, two atomic bombs were dropped on the Japanese cities of Hiroshima (6 Aug 1945) and Nagasaki (9 Aug 1945); the bomb dropped on Hiroshima was as powerful as 12,700 metric tons of TNT, that on Nagaskai was equivalent to 22,000 metric tons of TNT. The USSR first detonated an atomic bomb 1949 and the UK 1952.