The analysis of dosimetric thermoluminescent glow peak of  -Al₂O₃: C after different dose levels by  -irradiation

Abstract

The variable dose (VD), T m -T stop , initial rise, variable heating rate, peak shape and computerized glow curve deconvolution (CGCD) methods were used to determine the number of peaks, the order of kinetics (b), the activation energy (E a ) and attempt-to-escape frequency (s) associated with the dosimetric glow peak of α-Al 2 O 3 : C after β-irradiation at a dose level between 0.02 and 288 Gy. The E a -T stop and CGCD methods indicated that the dosimetric peak of this crystal is the superposition of at least two components (peak 2a and 2b). When the dose level reaches and exceeds saturation point, a third peak (peak 2c) is also evident on the low temperature side of the dosimetric peak. The VD and CGCD methods indicated that both components of the dosimetric peak have general-order kinetics that change with doses. The dose responses of peak 2a follow linear, supralinear, saturation and sublinear patterns, whereas peak 2b does not exhibit supralinear behaviour. They are saturated at different dose levels, peak 2a at D = 10 Gy and peak 2b at D = 5 Gy. E a -T stop plots obtained at two different dose levels (D = 10 and 1 Gy) indicated that the efficiency of thermal quenching effect on this sample is highly dependent on the dose level and decreases with increasing dose level, which also has pronounced effects on the evaluated kinetic and thermal quenching parameters of the dosimetric peak.

The analysis of dosimetric thermoluminescent glow peak of CaF2:Mn after β-irradiation

“…Therefore, the reduction of E a values was clearly observed by previous researches in this field [29,30]. The result of calculated activation energies is shown in Fig.…”

“…The used CGCD program, which is based on the least square minimization procedure, was developed at the Reactor Institute at Delft, The Netherlands [32]. In this study, the first-order kinetics were approximated for all CGCD evaluations by the expression [29,30]:…”

Analysis of thermoluminescence kinetics of Mg2SiO4:Tb compounds employing an interactive model

“…Determining the values of the trap parameters and the involved kinetics is of interest when the application of the TL phosphor in dosimetry is envisaged [10]. In fact, the behavior of the dosimetric glow peaks under different dose levels and irradiation conditions can be better understood if the underlying physical process is known [11][12][13].…”

Characteristic features of thermoluminescence kinetics in dosimetric aluminum oxide crystals

“…Deep trap filling is connected with the above-indicated characteristics, since it determines the competition for capture of charge carriers in the trap, which are responsible for the dosimetric peak. Data are available [6] indicating that this peak is not an elemental peak and that different luminescence mechanisms can be realized within its temperature range.We also know [2] that in the TL spectrum of the dosimetric peak there is a 330 nm component due to luminescence of F + centers (oxygen vacancies with one trapped electron). The concentration of F + centers can be varied by exciting the studied crystals with UV light in the absorption band for F centers (210 nm).…”

“…Deep trap filling is connected with the above-indicated characteristics, since it determines the competition for capture of charge carriers in the trap, which are responsible for the dosimetric peak. Data are available [6] indicating that this peak is not an elemental peak and that different luminescence mechanisms can be realized within its temperature range.…”