Thermoluminescence and optically stimulated luminescence characteristics of α-Al2O3：C crystal

In this work，α-Al2O3：C crystal was grown by temperature gradient technique using α-Al2O3 and graphite powder as raw materials， and the thermoluminescence (TL) and optically stimulated luminescence (OSL) of the crystal were investigated by Ris TL/OSL-DA-15. The as-grown α-Al2O3：C crystal shows a single TL peak at 462K and blue emission peak at 410nm. The TL intensity increases as irradiation dose increases， but no shift is found in the position of the glow peak. The OSL decay curve of α-Al2O3：C crystal consists of two components， namely the fast component and the slow component. With the increasing of the dose，the decay rate of the fast component almost remains unaltered while that of theslow component increases. The TL response of the crystal shows excellent linear characteristic in the dose range of 5×10-6—10Gy， and saturation is observed at 30Gy. The OSL response shows excellent linear characteristic in the dose range of 5×10-6—60Gy， and reaches saturation at 100Gy. Compared with TL response， OSL response shows higher sensitivity and wider linear dose response.