Figure 2. Bremsstrahlung spectra with the maximum energy of 20 and 30 MeV calculated by GEANT4

From

Evaluation of the Average Weighting Factor in Thin Layer Irradiation by Bremsstrahlung

A.V. Belousov, U.A. Bliznyuk, A.P. Chernyaev

Biomedicine and Biotechnology. 2014, 2(4), 80-84 doi:10.12691/bb-2-4-3