Abstract: The verification method and standard were studied to be used for identification whether food was irradiated or not with thermoluminescent dosemeter (TLD). After the mineral materials were isolated from the samples, its peak area integral G 1 of the thermoluminescent curve was measured by TLD. Then the mineral materials were irradiated by at dose of 1kGy, and its peak area integral G2 of the thermoluminescen curve was also measured. The ratio of G1/G2 was calculated as criteria whether the sample had already irradiated or not. Eighty five samples from six classes of food which are allowed to be irradiated in China were tested, and concluded that when G1/G2≥0.10, the sample was verified as having been irradiated, while G1/G2<0.10, the samplewas verified as having not been irradiated.

Key words: irradiated foods, thermoluminescent analysis, mineral material, verification method