Enhancing Roentgen Sensitivity of Gold-Doped CdIn2S4 Thiospinel for X-Ray Detection Applications

The single crystals CdIn2S4Au were grown from preliminarily synthesized polycrystals by the method of chemical transport reactions in a closed volume with iodine used as a carrier. The influence of doping CdIn2S4 single crystals by gold (3 mol %) on their X-ray dosimetric parameters is studied. It is found that the X-ray sensitivity coefficients of CdIn2S4Au crystals increase 6–8 times compared with undoped CdIn2S4 at effective radiation hardness Va= 25–50 keV and dose rate E=0.75–78.05 R/min. Moreover, the persistence of the crystal characteristics completely disappears and the supple voltage of a CdIn2S4Au roentgen detector decreases threefold. The dependence of the steady X-ray-induced current in CdIn2S4Au on the X-ray dose is described by linear law. The studied crystals have a rather high room-temperature X-ray sensitivity (K=2·10-9–1.5·10-8 (A·min)/(R·V)) and are attractive as materials for X-ray detectors