Three-dimensional thermoluminescence (TL) spectra from MgAl₂O₄ irradiated with UV light were measured over 300∼600 K and 300∼800 nm. The peak positions of TL glow curves were shifted to lower temperature with increasing the exposure time of UV light. The 476 K TL glow curve is due to the second kinetics and its activation energy and escape frequency factor are calculated to be 0.85 eV and 1.92×10⁶ sec^-1, respectively. The TL spectra were split into 530 nm and 700 nm emission bands which were associated with V²⁺ and Cr²⁺, respectively. The linearity range of 700 nm emission band is smaller than that of 530 nm emission band, but the saturation time of 700 nm emission band is longer than that of 530 nm emission band.

KeywordsThermoluminescence, Thermoluminescence dosimetry, Supralinearity