Bremsstrahlung Spectra Corrected for Multiple Scattering in the Target

The spectral distribution in the forward direction of bremsstrahlung from a platinum target is evaluated for some typical cases, taking into account the multiple scattering of the incident electrons in the target. It is found that the proportion of high-energy photons is larger than in Schiff's intrinsic integrated spectrum. Tables are given of the correction factors to be applied to Schiff's spectrum for some typical target thicknesses and electron energies from 10-300 Mev. For incident electrons of energies 10-70 Mev it is found that the intrinsic differential spectrum for $\ensuremath{\vartheta}=0$ gives a better approximation to the spectrum corrected for multiple scattering than the integrated spectrum does.