Dosimetric properties of Al2O3 transparent ceramics doped with C

We have investigated scintillation and thermally-stimulated luminescence (TSL) dosimetric properties of Al₂O₃ transparent ceramics doped with different concentrations of C ions (0.001, 0.01 and 0.1%). The samples were synthesized by the Spark Plasma Sintering (SPS) technique. All the samples showed scintillation with emission peaks at 310, 410 and 693 nm under X-ray irradiation. Based on the scintillation decay times measured, the origins of emissions at 310, 410 and 693 nm were attributed to F⁺ centers, F centers and Cr³⁺ impurity ions, respectively. The samples show notable TSL with a glow curve consisting of peaks at 30, 100, 165, 230, 330 and 405 °C with much higher intensities than those of undoped Al₂O₃ transparent ceramics. A TSL response was confirmed to be linear to the irradiation dose over a range from 0.1 to 1000 mGy.