Food preservation by irradiation : proceedings of an International Symposium on Food Preservation by Irradiation / jointly organized by the International Atomic Energy Agency, the Food and Agriculture Organization of the United Nations, and the World Health Organization and held in Wageningen, 21-25 November 1977 / 国際原子力機関, 国際連合食糧農業機関, 世界保健機関, Wageningen InternationalSymposiumonFoodPreservationbyIrradiation