  An investigation into the appropriate materials for use as a diffuser foil in
electron radiography was undertaken in GEANT4. Simulations were run using
various refractory materials to determine a material of appropriate Z number
such that energy loss is minimal. The plotted results of angular spread and
energy spread are shown. It is concluded that higher Z number materials such as
tungsten, tantalum, platinum or uranium could be used as diffuser materials.
Also, an investigation into the handling of bremsstrahlung, multiple coulomb
scattering, and ionization in GEANT4 was performed.
