Abstract
Both energy and spatial distributions of fast neutrons inside infinite slabs of graphite (density = 1.72 gm · cm −3) are calculated. The blocks were irradiated (on the surface) with parallel and normal incident neutrons of 15 MeV with a beam diameter of 6 cm. Using Monte-Carlo technique, fluxes at different locations inside the medium, along and away from the incident beam's axis (radial position of the detector) were calculated. The calculations were performed for graphite slabs of different thicknesses ranging from 5 to 90 cm. Comparisons with some measurements are presented. The variation of the fast neutron build up factor with the depth inside the graphite block was investigated. Its dependence on the block thickness was also studied.
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