QUANTITATIVE DETECTION OF ABSORBED DOSE OF IRRADIATED DRIED FRUIT BY ESR SPECTROSCOPY METHOD

Sunflower seeds,walnuts,pistachios,and hazelnuts were used as experimental materials which were irradiated at 1.0,3.0,5.0 and 10.0kGy,respectively.The relationships and correlations between ESR signal intensity and irradiation dosages were studied.The results showed that ESR spectra of irradiated samples were obviously different from that of CK,and the ESR signal intensity was positively related with the irradiation dose.After irradiation,the ESR intensity and spectrum shapes all changed,and all four samples were clearly identified irradiated or unirradiated.The appearances of the two weak satellite lines which situated left and right to the intense singlet line in walnuts and pistachios proved the existence of cellulose radical.The detection dose limit of irradiated walnut was 1kGy,and the detection limits of the other three samples were lower than 1kGy.In conclusion,the ESR method could be used to irradiated.