Bremsstrahlung Spectral Photon Energy Distributions in Thick Targets

摘要

The Z-dependence of spectral photon energy distributions of external bremsstrahlung(EB) produced by ~(99)Tc beta particles in thick target,have been studied as a function of photon energy.The present results show that the values of the Z-dependence index,obtained from Bethe and Heitler,Elwert corrected Behe and Heitler,and-Tseng and Pratt theories,are not constant.The proportionality factor shows an exponential decaying dependency on the photon energy.