Supralinear response of LiF:Mg,Ti (TLD-100) after exposure to 100keV average energy X-rays

Influence of phantom materials on the energy dependence of LiF:Mg,Ti thermoluminescent dosimeters exposed to 20–300 kV narrow x-ray spectra,137Cs and60Co photons

“…The agreement observed for high energy photons suggests that this discrepancy could not be related to the experimental parameters such as: (a) heating rate (5 °C s − 1 in Davis et al versus 8 °C s − 1 in this work); (b) linearity, since the delivered air kerma (20 mGy in Davis et al versus 50-150 mGy in this work) at the dosimeter surface is within the linear region of the TL dose-response curve (Ixquiac-Cabrera et al 2011, Massillon-JL, Ávila and Brandan 2011, Massillon-JL, Gamboa-deBuen and Brandan 2006a); or (c) integration of the glow curve area (up to 240 versus 400 °C in this work). It is well known that the high temperature glow peak region is also linear at this dose level (Ixquiac-Cabrera et al 2011, Massillon-JL, Ávila and Brandan 2011, Massillon-JL, Gamboa-deBuen and Brandan 2006a. But, it could be presumably attributed to the smaller dosimeter thickness and/or the 1.6 mm PMMA slab used to cover the dosimeter during the irradiation in the experiment carried by Davis et al Such an assumption is based on the data depicted in figure 3 where the absorbed dose decreases drastically within the dosimeter thickness as the photon energy decreases and consequently, the normalization of the TL signal by the air-kerma at the dosimeter surface cannot reflect that variation.…”