TL and OSL studies on gallium sulfide (GaS) single crystals

Abstract Gallium sulfide (GaS) single crystals were investigated using thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements. TL experiments performed in the room temperature (RT)-450 °C range presented a glow curve consisting in six single discrete peaks. Analyses of TL glow curve by computerized glow curve deconvolution method showed that the trapping centers responsible for peaks are located at 0.98, 1.09, 1.15, 1.76, 1.87 and 1.90 eV. The order of kinetics found between 1 and 2 indicated the existence of general order of kinetics in TL process. Dose-dependent OSL measurements were performed in between 0.5 and 300 Gy. Taking into account the OSL response-dose relation, it was concluded that GaS single crystals may be a potential candidate as OSL dosimetric material in the 5 and 150 Gy range. Minimum detectable dose (MDD) value of the GaS single crystals were also determined using OSL signals. Furthermore, the reusability of GaS single crystals as dosimetric material and effect of fading with storage time were investigated.