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In this study, we investigated the applicability of the photostimulated luminescence(PSL), thermoluminescence (TL) and electron spin resonance (ESR) methods for freeze driedfruits which are not allowed to be irradiated in Korea. Apples and persimmons samples that hadbeen dried with a freeze drier were irradiated at a dose of 1, 3, 5, 7, and 10 kGy, using a gammaradiator with a cobalt-60 source. With the PSL method, the dried apples showed photon counts ofless then 700 counts/60 s (negative) in all the samples, whereas the dried persimmons that weregamma-irradiated above 3 kGy yielded photon counts of between 700 and 5,000 counts/60 s(intermediate). The TL results showed that this technique is useful for detecting irradiatedsamples; the TL ratios (TL1/TL2) measured for the food samples at an irradiation dose of 1 kGywere 0.13 for dried apples and 0.79 for dried persimmons. With regard to the results of ESRspectroscopy, the strength of the ESR signals from the dried fruits increased linearly in a dosedependentmanner. However, the characteristic signal was not found in all the samples. Inconclusion, the TL methods only can be used for the detection of gamma-irradiated dried applesand persimmons.
