The theory of the ionization and radiative corrections to electron scattering cross sections has been reviewed to determine the formulas most valid for the experimental arrangement at the NPGLINAC. Experimentally it has been determined that the corrections most nearly account for undetected electrons when the lower limit of the measured scattering spectrum is at least four half-widths below the peak of the spectrum. It has also been found that the corrections, most likely the Bethe-Heitler correction, induce a positive error of several percent to the cross-section when thick targets are used. (Author).