Properties of the thermoluminescence glow peaks simulated by the interactive multiple‐trap system (IMTS) model

Abstract

Thermoluminescence (TL) glow peaks were simulated over a wide range of absorbed doses using the interactive multipletrap system (IMTS) model. The absorbed dose range was divided into three regions; a region in which the measured TL signal grows quadratically with the absorbed dose, a supraquadratic dose-response region and dose-saturation region. The properties of the simulated glow peaks were investigated for each dose region. The different behaviors of the maximum peak position (T max ) with the absorbed doses were discussed. The applicability of applying the general-order kinetics (GOK), the mixed-order kinetics (MOK), and the developed one trap-one recombination (OTOR) center expressions on the IMTS glow peaks was investigated. The results showed that, in general, the developed OTOR expressions are the most apt expressions to be used in the peak-fitting method for the deconvolution of the experimental glow curves. The accuracy of the GOK and MOK expressions in describing the IMTS glow peaks is dependent on the value of the ratio of the trapping probability to the recombination probability (R ¼ A 1 /A m ) and the amount of the absorbed dose. New TL expressions based on the non-interactive multiple-trap system (NMTS) model were deduced.

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

“…(1). This, in fact, was expected, because it was concluded by Sadek et al [26] that the E values obtained by the peak fitting method using the analytical OTOR equation (Eq. (16=) and those obtained using the GOK equation (Eq.…”

“…The accuracy of these equations in calculating the activation energy was verified for the glow-peaks simulated by different TL models [24,26,27]. The main conclusion was that these equations are superior to the general-order kinetics (GOK) and the mixed-order kinetics (MOK) equations in the determination of the activation energy.…”

“…Sadek et al [26] concluded that changing the / o n N did not affect on the value of the computed E as long as 1 R < . Thus, it is suitable to set o n N = so that the final equation will be a function of only four unknown parameters.…”

“…Then, the dosimeters were irradiated with different doses using a 90 90 Sr Y -source. Sadek et al [24] investigated the influence of changing the absorbed dose-level on the kinetic parameters using a model of one active trap, one recombination center and one thermally disconnected deep trap (competitor). They concluded that the value of the activation energy of the active trap may change as competitor approaches the dose-saturation level.…”

“…In order to verify this explanation, the interactive multiple trap system (IMTS) model was utilized to simulate a set of glow-peaks irradiated by different doses. In this model, the electron traffic during the irradiation is given by the following set of differential equations [24]:…”