熱ルミネッセンス測定におけるエックス線の再照射線源としての利用

抄録

Thermoluminescence (TL) method has been used for detection of irradiated foods which are contaminated with silicate minerals. After the first TL measurement, minerals are re-irradiated with ⁶⁰Co-γ-rays for normalization and the first and second glow curves are compared. In the present study, the TL glow curves were investigated for quartz sand and minerals isolated from pepper and potato after the irradiation with gamma and 70keV of X-ray, in order to know the possibility of whether to be able to use X-rays as re-radiation source for normalization. Glow curves of samples irradiated with X-rays showed same shape and peak position as those irradiated with ⁶⁰Co-γ-rays, but large difference in intensity. The intensity of TL glow curve for X-ray was significantly larger than that for γ-rays. These results indicate that X-ray irradiation has a potential to apply for the confirmation of mineral isolation due to higher TL intensity, and as a reradiation source.