Similarities and differences between two different types of the thermoluminescence dosimeters belonging to the LiF family

Abstract

The kinetic parameters of the glow‐peaks of Harshaw – LiF:Mg, Ti (TLD) and Poland – LiF:Mg,Ti (MTS) dosimeters were investigated at different dose levels using the computerized glow‐curve deconvolution (CGCD) algorithm. The results showed that the glow‐curve structure and the kinetic parameters of the MTS – 6 and the TLD dosimeter are identical. In addition, the glow‐curve structure and the kinetic parameters of the MTS – N and MTS – 7 dosimeters. However, unusual low activation energy (∼1.67 eV) and frequency factor (∼1015 s–1) values were detected for peak 5 of MTS – N, and MTS – 7 at the 50 Gy dose‐level. Moreover, unlike the activation energy and the frequency factor of peak 5 of the TLD dosimeters, the activation energy and the frequency factor of peak 5 of MTS – N and MTS – 7 are substantially dependent on the absorbed dose level. The results also showed that peak 2 of the same dosimeters has also unusual low activation energy and frequency factor values. However, these values showed high stability over the different dose levels. The explanations of these unusual behaviors of peak 5 were discussed and a correlation between peak 2 and peak 5 was pointed out.

Deconvolution analysis of thermoluminescent glow curves in various commercial dosimeters using two different approaches in the framework of the one-trap, one-recombination model

“…It can be seen that the energy values of this peak are around 2 eV if all dosimeters are taken into account for an average evaluation. The energies of the first temperature region (<300 • C) are compatible with those presented by Sadek et al [11]. On the other hand, it is clear that the structure of the second region (> 300 • C), which is significant for both neutron as well as high dose dosimetry, yields a structure that is sample dependent.…”

“…Eventually, for the linear heating rate, the functions (Eqs. ( 4)-( 8)) of the Lambert approach were presented by Sadek et al [11,19].…”

“…Although the related theory is thoroughly established, the literature so far lacks manuscripts dealing with applications of the Lambert W-function [11]; this novel approach was applied for various TLD100 types, with different origins, and the results indicated that the glow-curve structure and the kinetic parameters of the TLD100s are identical. Moreover, Kitis et al [12] have suggested isothermal decay of TL in MgB 4 O 7 :Dy, Na and LiB 4 O 7 :Cu using the Lambert W-equation towards discriminating between radiative delocalized and radiative localized recombination processes.…”

AAPM TG 191: Clinical use of luminescent dosimeters: TLDs and OSLDs

“…For example, in addition to TLD‐100, LiF:Mg,Ti is also produced in Europe as MTS‐N with slightly different concentrations of dopants. TLD‐100 and MTS‐N behave equivalently for practical applications, but differences do exist in terms of glow curve structures and relative trap heights …”

“…TLD-100 and MTS-N behave equivalently for practical applications, 26 but differences do exist in terms of glow curve structures and relative trap heights. 27 The values in Table I are only rough estimates; actual values may depend on the batch and may also depend on the form of the crystal (see Section 4 for more details). However, general characteristics, techniques for determination of correction factors, and dose formalisms established in this report should be broadly applicable to any LD materials.…”