Preparation of CaF2 Thermoluminescence Dosimeter and Investigating of the Influence of Dy Impurity in it’s Dosimetric Properties

In this study, CaF2 pellet samples were prepared and its thermoluminescence (TL) properties were investigated after gamma irradiation. The TL glow curve of the CaF2 pellet has four peaks at around 135, 170, 260 and 370ºC for the heating rate of 10ºC/S. The main peak occurs at 260ºC. The sensivity of CaF2 and Dy doped CaF2 were examined. The observed TL sensivity of the prepared CaF2 pellet is abut five times than that of TLD-100. The sensivity of the Dy doped CaF2 is approximately 18 times higher than that of TLD-100. The fading is approximately 13% in one day, 36% in two days and 50% in 500 hours. These examinations repeated for 10 times and all the results were found to be consistant. These properties make the CaF2 pellets a useful can dilate for γ-ray irradiation dosimetry applications.