Bremsstrahlung Spectrum from the Internal Target of a 22-Mev Betatron

Abstract

The intensity and energy distribution of the bremsstrahlung photons produced in a betatron operating at 22 Mev have been determined by measurement of the energy spectrum of photoprotons ejected from deuterium. The protons were detected using a 0.15 cm thick NaI crystal followed by a 100-channel pulse-height analyzer. The photon beam was highly collimated in the forward direction. If one assumes the energy dependence of the cross section for the photodisintegration of deuterium as given by Hulth\'en, the computed bremsstrahlung energy distribution is in excellent agreement with the theoretical thin-target spectrum. The observed total intensity is that indicated by monitoring using an "$R$" thimble imbedded in 3.9 cm of Lucite.