A new thermal neutron flux convention is proposed where the neutron slowing down spectrum per unit energy varies as l/E1+B (I/? In El e < 1). The neutron capture rate per atom for a detector may be written as where n is the neutron density, v, is the conventional 2200 m/s velocity, U, is the 2200 m/s neutron capture cross-section, C(@, 2') is a renormalisation correction to the epithermal flux fraction f at temperature T, h(P) is the correction to the reduced resonance integral I' defined for a l/E flux, g( T) is the Westoott function and (7th and Gr are the thermal and resonance selfshielding factors. For the case /? = 0 this expression reduces to the Westcott form.Tables of h(B) are presented for a number of commonly used isotopes, and C(/?, T ) has also been tabulated.A simple experimental method for memuring /? is given which only involves the ratio of the cadmium-covered activities of standard manganese and gold detector foils, and the method has been applied to several different standard neutron flux assemblies. nflo 00 [athS(T) + f C(/% T ) Qrh(B, Cr,)Ir/0oI 19 Metrologia 119 International Conference on the Peaceful uses of Atomic Energy, Geneva, United Nations (1958).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.