A series of alumina (Al 2 O 3 ) ceramics doped with different concentrations of scandium (Sc) were synthesized by using spark plasma sintering (SPS) for characterizing luminescence properties. Two emission bands around 340 and 440 nm were observed under excitation of 280 nm as well as during X-ray irradiations. The emission bands, which were ascribed to F + -and F-centers, respectively, showed lifetimes on the order of microsecond. The lifetime, especially for scintillation, increases with increasing dopant concentration. The number of glow peaks in thermally stimulated luminescence (TSL) after X-ray irradiation effectively decreases with increasing doping concentration. When doped with 2.0% Sc, the glow curve consists of only a single peak, and a stable storage was experimentally confirmed up to 1000 min after the irradiation. Furthermore, the TSL monotonically responds to the incident X-ray dose in the range of 0.5-10000 mGy.
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