1975: And the Changes To Come
How to Preserve Foods. A rack of canned beans is lowered into a radioactive container where, in six to twenty minutes, the beans will receive enough radiation to preserve them indefinitely. Atomic radiation of foods will be routine in the seventies. Meats, vegetables, and fruits will be preserved by the process. Radiated foods can be kept for years with little or no refrigeration.
from 1975: And the Changes To Come by Arnold B. Barach