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A Monte Carlo Computer Program has been used to investigate the effects of sample size, shape, and composition on the amount of energy lost from a monoenergetic neutron beam incident upon one face of the sample. Cylinders, spheres, and rectangular parallelepipeds are considered. The composition calculations confirm that the energy absorbed by compound samples can be calculated, using a simple additivity assumption, from data obtained for pure element samples provided the pure element and compound samples are the same size and shape. The effect of sample shape was investigated by calculating the energy lost by monoenergetic neutrons in penetrating cylinders of identical mass but widely varying thickness and radius. It is apparent from these data that neglect of sample shape can lead to serious errors in the calculation of energy absorption values.
Johnston, R. L.
Convair, a Division of General Dynamics Corp., Fort Worth, Tex.