Glow curve deconvolution of nano barium strontium sulfate and thermoluminescence trap centers behavior with gamma doses

The kinetic parameters and the dose response of each trap in the nano (Ba0.88Sr0.12SO4)99.8%:Eu0.2% (B88) thermoluminescence dosimeter were investigated using the computerized glow-curve deconvolution (CGCD) algorithm. The glow-curve of nano B88 could be deconvoluted into five glow-peaks using general expressions derived from the one trap-one recombination (OTOR) level model. The analysis results showed that the activation energy E and the frequency factor s for each glow-peak remained approximately constant over a wide range of doses. The change of trapping-recombination ratio R parameter with gamma absorbed dose for all the deconvoluted peaks was studied. The glow curve shape of nano B88 changes with the absorbed dose, forasmuch the first shoulder of glow curve becomes most prominent beyond 1 kGy. The linearity of the dose-response of all the glow-peaks was proved except for peak 5. The CGCD analysis method reveals that the peak 1 can be considered as dosimetric peak by increasing the linearity range of dose response up to 4.5 kGy instead of 2 kGy.