The thermoluminescence (TL) glow curves, three-dimensional emission spectra and optical-stimulated luminescence (OSL) of undoped α-Al2O3 single crystals were investigated. Two glow peaks at 76 and 207 ℃ are observed after β-rays irradiation of Sr-90 source. After γ-rays irradiation the emission spectra of α-Al2O3 show that the emission peak of 416 nm wavelength at about 207 ℃ is related to the relaxation of an electron from the excited 3P state to the ground state 1S of the F center. The first order kinetic equation can fit the 207 ℃ glow peaks well. Besides, the measured shape and peak temperature of the glow curves are almost not related to the absorbed dose. The dose response of the peak heights is linear-sublinear. Therefore, it is concluded that the glow peak at 207 ℃ at 416 nm can be described by the first-order kinetics. The dose responses of OSL and TL are linear-sublinear.