ON THE ANALYSIS OF FILTERED SWING MEASUREMENTS

摘要

This report deals with the following problem.nGiven a pile which has a small hole in its interior, the walls of the hole being lined with a neutron filter such as cadmium, it is required to analyse the effect on the pile reactivity of placing a neutron absorber in the hole. The theoretical model adopted is chosen to represent the following two physical processes which are responsible for the reaction of the absorber on the pile, i.e. the "swing" of the absorber is proportional to the integrated productn(i) The fraction of neutrons of a given energy which are absorbed (or emitted) by the sample "the absorption effect".n(ii)The probability that the neutrons so captured would have taken part in the chain reaction if they had not been captured -"the fate effect"