title: Epithermal neutron self-shielding factors in foils for collimated beams.
abstract: An epithermal neutron self-shielding factor must be introduced to take into account the absorption of a neutron beam crossing a sample. This factor depends on the geometry and dimension of the sample, as well as on the physical and nuclear properties of the nuclides. On the basis of a dimensionless variable, which includes the relevant characteristics of the sample, universal curves for monoenergetic and 1/E collimated neutron beams are proposed, which enable the determination of the self-shielding factor for isolated resonances of high absorber nuclides.
authors.affiliation: Instituto Tecnológico e Nuclear, Estrada Nacional 10, Sacavém 2686-953, Portugal.
authors.forename: J
authors.initials: J
authors.lastname: Salgado
authors.forename: I F
authors.initials: IF
authors.lastname: Gonçalves
authors.forename: E
authors.initials: E
authors.lastname: Martinho
mesh_terms: D006046:Gold / Q000737:chemistry; D007504:Iron Radioisotopes / Q000737:chemistry; D009502:Neutrons; D011835:Radiation Protection / Q000379:methods*; D012542:Scattering, Radiation; D013910:Thorium / Q000737:chemistry
chemical_list: D007504:Iron Radioisotopes; D013910:Thorium; D006046:Gold