Neutron Self-Shielding Factor of Scattering-Predominant Resonance Foils

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The neutron self-shielding factor of 59Co resonance foil as an example of foils whose scattering crosssection predominate over their absorption cross sections was obtained by both Monte Carlo method (analog) and the collision probability method for various thicknesses of the foil. Also, the ansmission and reflection probabilities of neutrons which have various energies near the resonance energy were obtained, and the effects of multiple scattering of neutrons on the neutron self-shielding factor are discussed. <BR>The neutron self-shielding factors obtained by the Monte Carlo method and by the collision probability method agreed well with each other in the cases Σt ?? 4.0, in which the Monte Carlo method requires considerably longer machine time. Although for the cases of large Σt( ?? 4.0) the agreement is not always good because of the flat flux approximation in the collision probability method, the calculation time by Monte Carlo is conveniently short. A combination of both methods is useful in obtaining the neutron self-shielding factor of resonance foils.
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