Abstract
The derivation and proper use of a formula originally published in 1959 for thermal neutron self-shielding computations in scattering bodies are presented. It is shown that the f{sub 0} entity in this formula must be computed using the total macroscopic cross section {Sigma}{sub t} instead of the macroscopic absorption cross section {Sigma}{sub a}, as was stated in previous publications. The validity of the formula is verified by Monte Carlo computations.
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