fisson (cont'd) “8 ( Plutonium-239, ‘Although these substances are radioactive, they have relatively long half-lives, so that they may be regarded as moderately stable, Also, they will undergo fusion by. the capture of neutrons of all energies~either fast (high energy) or slow (low energy). fractionation The breaking down of nuclear particles or of radioactive debris into various chemicals, Such breakdown increases difficulties of identification through radio-chemical analysis, fusion A mclear reaction in which light nuclei combine to form a nucleus of a higher mass number, This process can be said to represent the opposite to nuclear fission, The fusion of nuclei of a low atomic number releases large amounts of energy. Such fusion reactions go on constantly in the interiors of stars and form the basic principle of the ~ thermonuclear bomb, fuzing system That portion of a weapon which originates the signal which triggers the firing system, The fuzing system normally consists of such components as radars, baro switches, timers, impact crystals, antennas, baro sensing elements, and the like. G or G-force Force exerted upon an object by gravity or by reaction to acceleration or deceleration, as in a change of direction; one G is the measure of the gravitational pull required to move a body at the rate of about 32.16 feet per second, gamma ray Short wavelength electromagnetic radiation originating in the nucleus of certain radioactive atoms, The rays possess great penetration capabilities and, as associated with nuclear detonations, constitute a potential health hazard. guided missile A trajectile that is directed to its target while in flight or motion, either by a preset or self-reacting device within the trajectile or by radio command outside the missile, 323 AFWL/H@ SWEH -2 -0034 ye lie