Abstract
Photostimulated luminescence (PSL) measurement, DNA comet assay, electron spin resonance (ESR) spectroscopy and thermoluminescence (TL) measurement were applied to identify irradiated chestnut. Samples were irradiated with 60Co γ-rays at 0–0.5 kGy. The PSL photon counts for irradiated chestnuts were too low to be distinguished from those of the non-irradiated sample. There was no difference in DNA comets between non-irradiated and irradiated chestnuts. ESR spectroscopy did not show any radiation-induced specific signals but a symmetric singlet. However, using TL, the shape of the glow curve (Glow 1) made it possible to identify the irradiated chestnuts. In addition, the TL glow ratio (Glow 1/Glow 2) obtained by normalization was less than 0.01 for the non-irradiated sample and ≥0.10 for irradiated ones, respectively.
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