Thermoluminescence property of LiMgF3 erbium activated phosphor.

The perovskite-like LiMgF3:ErF3 pellets were obtained from the melt formed by LiF and MgF2 mixed salts in the stoichiometric ratio. The perovskite material was doped with 1, 2 and 4mol% of ErF3 impurity. The pellets samples were 60Co gamma irradiated and their thermoluminescence (TL) properties were analyzed, i.e., dose–response, fading at RT and under UV irradiation, TL signal reproducibility, and kinetic parameters. The intensity of the TL response against irradiation dose was increased remarkably by the high concentration of impurity, and a linear dose–response was observed in the range of 1–10Gy. The fading observed at RT was about 10–30% after 24h from irradiation. All samples were exposed from 1 to 200Gy gamma dose range. The TL glow peaks were found around 367–376, 438–447, 509–521, and 594–611K, when the doped samples were 1, 2 and 4mol% of the erbium impurity concentration. The thermoluminescence kinetics parameters of the glow curves have been analyzed using the Computerized Glow Curve Deconvolution (CGCD) method.