Transmission and Backscattering of 4.0- to 12.0-MeV Electrons

Transmission and backscattering coefficients were measured for 4.0- to 12.0-MeV monoenergetic electrons normally incident on solid targets of C, Al, Cu, Ag, Ta, and U. Transmitted and backscattered electrons were collected by biased Faraday cups, each subtending ∼90% of $2\pi$ sr. Number transmission coefficients at 10 MeV agree with Berger and Seltzer's Monte Carlo results, and saturation backscattering coefficients generally agree with Tabata's results to within ±10%. Empirical formulas for determining the extrapolated range and both the transmission and backscattering coefficients as a function of $Z$, energy, and thickness have been developed.