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Monte Carlo calculation of epithermal neutron resonance self-shielding factors in foils of different materials
Ist Teil von
Applied radiation and isotopes, 2002-06, Vol.56 (6), p.945-951
Ort / Verlag
England: Elsevier Ltd
Erscheinungsjahr
2002
Link zum Volltext
Quelle
Access via ScienceDirect (Elsevier)
Beschreibungen/Notizen
Epithermal neutron resonance self-shielding factors in foils of materials used as activation detectors or as targets for radionuclide production have been calculated using the MCNP code. Two irradiation conditions have been considered: (a) foils immersed into an isotropic neutron flux and (b) foils submitted to a collimated neutron beam. The self-shielding factors,
G
res
(
t), for gold, indium, manganese and cobalt have been compared with available published values. The self-shielding factor depends on various physical and nuclear parameters. However, it is shown that for the isotropic case and for high absorber elements submitted to a collimated beam, a dimensionless variable could be adopted that describes the self-shielding factors of different materials by quasi “universal curves”.
G
res
(
t) for the collimated beam are always higher than those for the isotropic case.