Atomic Bomb - or A-bomb, weapon deriving its explosive force from the release of atomic energy through the fission (splitting) of heavy nuclei (see
nuclear energy). The first atomic bomb was produced at the Los Alamos, N.Mex., laboratory and successfully tested on July 16, 1945. This was the culmination of a large U.S. army program that was part of the
Manhattan Project, led by Dr. Robert
Oppenheimer. It began in 1940, two years after the German scientists Otto Hahn and Fritz Strassman discovered nuclear fission. On Aug. 6, 1945, an atomic bomb was dropped on
Hiroshima with an estimated equivalent explosive force of 12,500 tons of TNT, followed three days later by a second, more powerful, bomb on
Nagasaki. Both bombs caused widespread death, injury, and destruction, and there is still considerable debate about the need to have used them. Atomic bombs were subsequently developed by the USSR (1949; now Russia), Great Britain (1952), France (1960), and China (1964). A number of other nations, particularly India, Pakistan, and Israel, now have or believed to have atomic bombs or the capability to produce them readily. The three smaller Soviet successor states that inherited nuclear arsenals (Ukraine, Kazakhstan, and Belarus) relinquished all nuclear warheads, which have been removed to Russia. Atomic bombs have been designed by students, but their actual construction is a complex industrial process. Practical fissionable nuclei for atomic bombs are the isotopes uranium-235 and plutonium-239, which are capable of undergoing
chain reaction. If the mass of the fissionable material exceeds the critical mass (a few pounds), the chain reaction multiplies rapidly into an uncontrollable release of energy. An atomic bomb is detonated by bringing together very rapidly (e.g., by means of a chemical explosive) two subcritical masses of fissionable material, the combined mass exceeding the critical mass. An atomic bomb explosion produces, in addition to the shock wave accompanying any explosion, intense neutron and gamma radiation, both of which are very damaging to living tissue. The neighborhood of the explosion becomes contaminated with radioactive fission products. Some radioactive products are borne into the upper atmosphere as dust or gas and may subsequently be deposited partially decayed as radioactive
fallout far from the site of the explosion. See
disarmament, nuclear;
hydrogen bomb;
nuclear strategy; and
nuclear weapons; see also
nuclear energy. See G. Herken, The Winning Weapon (1988) and Brotherhood of the Bomb (2002); R. Rhodes, The Making of the Atomic Bomb (1986); R. Serber, The Los Alamos Primer: The First Lectures on How to Build an Atomic Bomb (1992); R. Fermi et al., Picturing the Bomb: Photographs from the Secret World of the Manhattan Project (1995); P. B. Hales, Atomic Spaces: Living on the Manhattan Project (1997). The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved. |