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E. Aalto, R. Fräki, K. Malén
Nuclear Science and Engineering | Volume 22 | Number 4 | August 1965 | Pages 443-450
Technical Paper | doi.org/10.13182/NSE65-A20630
Articles are hosted by Taylor and Francis Online.
Recommended values have been experimentally obtained for the angle (defined by its cosine µ0 in center-of-mass system) that determines the boundary between ‘removal’ and ‘nonremoval’ collisions and regulates the deep penetration of neutrons in the NRN method. Measured attenuations in three different, most common, shield materials: water and magnetite and ordinary concrete, give µ0 = 0.6 (± 0.1) for elements with A > 1. For hydrogen, µ0 = 0.45 is recommended. The results indicate, besides, that the neutron flux predictions are not overly sensitive to the changes in the removal source, caused by varying µ0. The usual smoothing effect of the diffusion is material dependent, and the strength of the coupling between removal and diffusion parts is seen to decrease when going from water to magnetite and ordinary concrete.