Investigation of CaSO4:Dy Thermoluminescence Dosimeter Response to Gamma Ray Doses

CaSO4:Dy thermoluminesconce dosimeter (TLD) is one of the best materials for environmental and personal dosimetry due to its high sensitivity and high dose saturation. In this investigation, the dose response of CaSO4:Dy with three concentrations, 0.11, 0.15 and 0.2 mol% of dysprosium, to 60Co gamma rays doses up to 3.7Gy were studied. The effect of heating program on glow curve was also studied. The glow peaks of CaSO4:Dy were seen at 100oC and 167oC. The pellets have high sensitivity and in the case of sample with 0.2 mol% of dysprosium, the relative sensitivity is 12. The dose response is found to be linear up to 3.7Gy and the fading was approximately about 36% in 10 days.