Target thickness dependence of bremsstrahlung from solid films

We report initial results of a study of the target thickness dependence of bremsstrahlung from solid film targets. The electron beam energy is 50 keV and bremsstrahlung is observed at 90°. Targets are aluminium and gold. Target thicknesses from 50 μg/cm2, where single interaction conditions apply, to twice the electron range, where a multiple interaction model applies, were studied. We observe the transition from thin to thick film spectra. The purpose is to investigate whether the polarization bremsstrahlung contribution may be suppressed in solid film targets.