X-ray-Induced scintillation properties of Cr-Doped Mg4Ta2O9 single crystals in Near-Infrared regions

0.1 %, 0.5 % and 1 % Cr-doped Mg4Ta2O9 single crystals were synthesized by the floating zone method and their photoluminescence (PL) and scintillation properties were assessed. Cr-doped Mg4Ta2O9 single crystals showed a broad PL band between 700 and 1100 nm in the near-infrared region, which is attributed to the 4T2-4A2 (4F) transition of Cr3+. As the scintillation properties, Cr-doped Mg4Ta2O9 single crystals show broad emission bands at 300-450 and 750-1100 nm, which were attributed to charge transfer from Ta5+ to O2- and the 4T2-4A2 (4F) transition of Cr3+, respectively. The afterglow levels of the 0.1 %, 0.5 % and 1 % Cr-doped Mg4Ta2O9 single crystals were 9.5, 33.8 and 47.0 ppm, respectively. As a characteristic of a scintillation detector, the lower detection limits were 0.001 Gy/h for the 0.1 % sample, 0.003 Gy/h for the 0.5 % sample and 0.006 Gy/h for the 1 % sample based on the dose rate response function.