Most of the studies have been government sponsored at least partly because the 1958 Food Additive Amendment to the Food, Drug and Cosmetic Act required advance proposal from the Food and Drug Administration (FDA) before any particular irradiated food could be publicly sold.
Earlier work (1947-1952) was carried out by at least three private companies in the United States.
A similar circumstance prevailed in other countries, resulting, worldwide, in predominantly government sponsored food irradiation research programs.
Because of the lack of research facilities in many third world countries, specialized agencies of the United States also became actively involved in international food irradiation research programs.
Radiation preservation of foods in United States