Studies on radiation preservation technique of green raisins

The study of preservation of green raisins by killing ovum and larva of India moth [Plodia intepunella (Huebner)] with 60Co-γ rays to prolong preservation period was carried out. The results showed that the lethal dose for ovum in the raishin is 3.5 kGy, and the lethal dose for larva is 3.0 kGy. At the normal temperature green raisin could be preserved over eight months by irradiation, the safe preservation over summer period in Xinjing was achieved. Critical dose, with which the irradiation wouldn't change the sensible characters of quality of green raisin, is 5.0 kGy. By irradiation of 2.0-4.0 kGy the sanitary quality of raisin was improved obviously. Nutritive component of irradiation raisin didn't show obvious change, and its deliciousness was not varied at all. Through irradiation of 1.8-60.0 kGy there were not any new induced radioisotope and radiopollution in raisins. Complete study showed taht the preservation of green raisin through irradiation of 3.5 kGy is agreeable to standard of health