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FIRST-COLLISION MOMENTS METHOD
GENERAL DYNAMICS/FORT WORTH TEX
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Dose rates resulting from fast neutrons that penetrate the walls of a shielded compartment are calculated by a First-Collision Moments FCM Method. The particular advantage of this method is that it can be applied to incident neutrons having arbitrary angular and energy distribution. A combination of single-scattering theory and moments-method data are used in the development of the FCM method. The results are presented in the form of a ratio of the transmitted dose rate to the initial dose rate for initial energies of 15, 10, 8, 5, 4, 2, and 1 Mev and incident angles of 30 degrees, 60 degrees, and 90 degrees. Calculated fast-neutron dose rates are compared with available measured dose rates. Author
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