Backscattering of 8-28Â keV electrons from a thick Al, Ti, Ag and Pt targets

Measurements of electron backscattering coefficient η for thick Al, Ti, Ag and Pt targets have been made for incident electrons with energy 8-28 keV. The variations of η with angle of incidence α, impact energy E0 and with target atomic number Z have been studied. The data are compared with available theories. The mean fractional energy absorbed in the backscattering process has been determined and compared with an analytical expression and with Monte-Carlo simulations based on the Kanaya and Okayama electron-electron and electron-nucleus interactions and on the Quinn electron-plasma interactions. The comparison between our experimental data and the model calculations using Monte-Carlo simulations and analytical expression shows a reasonably good agreement among themselves within experimental errors of measurements.