In a study made for the U. S. Army Quartermaster Corps, all of the known types of radiation sources of sufficient size to be of interest in large scale radiation processing were compared. The sources considered are spent fuel elements from a power reactor, fission product gases from a fluid-fuel reactor, separated fission product Cs/sup 137/, reactor-coolant Na/sup 24/, neutronactivated In/sup 116m/ charged particle accelerators, and x-rays. The results are summarized. (auth)