Simulation of the experimental thermal cleaning procedure in LiF:Mg,Ti and investigation of the origin of the first-order kinetics of its peaks

Abstract

In this paper, the simulation of the thermal cleaning procedure in LiF:Mg,[Formula: see text]Ti as well as the investigation of the origin of its glow-peaks have been performed by six electron trapping levels and one recombination center phenomenological model. The most generally accepted parameter of the glow-peaks 1 to 5 of LiF:Mg,[Formula: see text]Ti is their first-order kinetics; this was particularly investigated by the use of the random variation of the kinetic parameters method.

The ability of E and S values to predict experimental thermal fading rates

“…2 for 140°C (it has to be noted that only first temperature is shown). The calculated kinetic parameters for each of the three peaks are shown in Table 1 and the values are comparable to the Refs [10,11]. The frequency factor was evaluated using the following equation:…”

“…The fading of the thermoluminescent (TL) output signal is a seriously annoying property of thermoluminescent dosimeters (TLDs) that is important to characterize, in order to accurately relate TL output with amount of radiation exposure [1,[14][15]. Previous authors used postirradiation treatments to empty the low temperature TL traps and remove the low temperature glow peaks before readout to reduce or eliminate this fading [5,10,[16][17]. Izak-Biran et al [5] concluded that the application of post-irradiation procedure significantly reduces fading due to the removal of the minimum temperature peaks.…”

“…Wide variation in fading characteristics measured for LiF:Mg,Ti demonstrates the complexity involved in characterizing a fading rate [2][3][4]15]. The trapping parameters; the activation energy (E) and frequency factor (s) of the glow-peak 3, 4 and 5 of LiF:Mg, Ti have been extensively studied [3,[6][7]10]. This work was designed to characterize the postirradiation fading of the individual peaks of glow curves to better understand the fading of the integrated TL response and also the evaluation of a stable and reproducible integrated signal for LiF:Mg,Ti.…”

Pre- and Post-Irradiation Annealing for TLD 600 and 700 Dosimeters; Comparison of the Properties of TL Glow Peaks 5 and 5a

“…LiF:Mg,Ti is largely employed to study the TL effects of parameters such as supralinearity, impurity concentration, radiation damage, etc. [1, 5,22,24].…”

“…According to this terminology, kinetic parameters, such as the activation energy E, frequency factor s, and kinetic order b, for the so-called glow peak 5 of LiF:Mg,Ti have been a major topic of TL research for many years. The interest on this topic is not only limited to the fact that LiF:Mg,Ti has been extensively used as a basic TL dosimeter, but rather enhanced due to specific peculiarities related with the reported values of E, s and b as well [6,7,24].…”