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A brief discussion is given on the specification of reactor differential flux spectra for both neutrons and gamma rays, specifically on the differential flux spectra of a typical light-water-moderated reactor, the Ground Test Reactor. Following this, calculations of displacement production rates in crystalline solids such as metals and semiconductors for various specifications of the neutron flux spectrum are given. Examples are chosen to illustrate the relative importance of the various energy groups of neutrons. The extent of the errors introduced in the calculations, when incorrect specifications of flux spectra are used, is indicated. The importance of specifying differential gamma flux spectra in radiation damage studies concerning organics is stressed briefly.
Convair, a Division of General Dynamics Corp., Fort Worth, Tex.