  We have benchmarked the QGSM code and event generators of the MARS and LAHET3
codes as potential candidates for high-energy programs to be used in
simulations for the Proton Radiography (PRad) Project. We have compiled from
the literature experimental data on spectra of particles emitted from
proton-induced reactions at incident energies from 30 GeV to 70 GeV on
different nuclei and have performed calculations for all reactions for which we
found data with these three codes without any modifications and using only
default parameters and standard inputs. Our results (514 plots) show that all
three codes describe reasonably most of the studied reactions, though all of
them should be further improved before becoming reliable tools for PRad. We
present here our conclusions concerning the relative roles of different
reaction mechanisms in the production of specific secondary particles. We
comment on the strengths and weaknesses of QGSM, MARS, and LAHET3 and suggest
further improvements to these codes and to other models.
