In this study, dosimetric phosphor, α-Al2O3 nanopowder was prepared using the soluble combustion method and its thermoluminescence (TL) characteristics were analyzed. In order to improve thermoluminescence properties of α-Al2O3, the nanopowder was doped with Mg and Li, transition metals and was annealed. Structural and morphological characteristics of synthesized α-Al2O3:Mg,Li nanopowder phosphorwere identifiedvia X-ray Diffraction, Scanning Electron Microscopy. Finally, thermoluminescence properties of the α-Al2O3 nanopowder, doped with different amounts of Mg (0.2 wt% - 0.8wt%) and Li(0.5wt%-1.5wt%) were studied. The best thermoluminescence effect was achieved via the co-doped of Mg and Li in α-Al2O3 nanopowder. X-rays analysis determined that the crystalline structure of the synthesized Mg and Li doped α-Al2O3 was completely consistent with α-Al2O3crystalline structure. Also, TL analysis showed that after thermal annealing, some peaks of curves disappear. The sample of α-Al2O3:Mg0.4% had the peak before and after annealing; the sample of α-Al2O3:Mg0.4%,Li1%, had the strongest peak after the annealing. For synthesis of α-Al2O3 samples by solvent-combustion method, the raw material of (Al(NO3)3.9H2O) and (H4N2CO) were used. In addition to the abovementioned materials, LiNO3 and Mg(NO3)2 were also used to prepare the doped speciens.

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