Study of dose response, luminescence kinetics, and reading modes combination advantage of TLD-100H radiation dosimeter

Abstract

Background: This study investigates various aspects of TLD-100H radiation dosimeter, including luminescence kinetics, dose response, and the effects of the combination of thermally stimulated (TL) and optically stimulated (OSL) luminescence modes. Materials and Methods: The TL kinetic parameters were determined using general order kinetics via computerized glow-curve deconvolution (GOK-CGCD). OSL decay curves and kinetics were also investigated through OSL signal decomposition. The dose response was studied for a practical dose range of 2-80 Gy. Interesting OSL and TL reading modes combination were also tested. Results: The identified dosimetric peak at ~560 K was deconvoluted into two main peaks (553K and 568K). The dose response study reveals a sublinear behaviour within the considered dose range. Two dominating types of fast and slowly decaying OSL traps were identified. Indicative values of detrapping probabilities and photoexcitation cross sections of these OSL traps are thus provided. Results of TL and OSL reading modes combination demonstrate well that measuring TL signal before OSL resulted in almost complete erasure of the OSL signal. Additionally, an increase in TL integral intensity by ~+10% was observed when OSL measured firstly, likely due to the emptying of a limited number of lower temperature shallow traps by OSL. Indeed, these no longer applied a screen effect for the higher temperature traps, making their release more prominent in TL reading mode. Consequently, improving or optimizing the TL signal. Conclusions: These findings contribute to a better understanding of TLD-100H’s behaviour and support its reliability as a radiation dosimeter in medical physics.