Thermoluminescence characteristics of gamma irradiated CaS:Ce nanophosphors

Thermoluminescence behavior of gamma irradiated CaS:Ce nanophosphors have been presented. CaS:Ce (0.2 mol%) shows two peaks one around 400 K and a high temperature peak around 560 K at a heating rate of 5 K/s. TL intensity increases up to 5.76 kGy of gamma exposure and afterwards it decreases. The linearity of CaS:Ce nanophosphors over a wide range of dose is explained on the basis of track interaction model (TIM) and large surface to volume ratio of nanoparticles. Effect of different heating rates on the TL glow curve has also been investigated. The trapping parameters: activation energy (E) and order of kinetics (b) for CaS:Ce (0.2 mol%) have been calculated.