A new method for obtaining the trap parameters of complex thermoluminescence glow peaks

Abstract

A new method is described to obtain the trap parameters of thermoluminescence (TL) glow curves including several peaks. The method starts with obtaining the trap parameters of the higher temperature glow peak. The evaluation of the trap parameters of this peak starts with determining the order of kinetics b. Two different equations are developed to estimate b. Thereafter, the activation energy E (eV) and then the frequency factor or the pre-exponential factor of this peak are determined. The shape of this peak is then fitted to an equation of the order of kinetics depending on the determined value of b. Using the previously determined shape, the higher temperature peak is scaled up to fit the decreasing portion of the combined peak. The procedure is then repeated to account for each of the remaining peaks in the glow curve.

Accuracy of the activation energy calculated from a thermoluminescence glow‐peak using a method that uses three points on the peak

“…The kinetic analysis method proposed by Rasheedy [6][7][8] was used to calculate the activation energy of the simulated glow-peaks including when the retrapping probability is greater than the recombination probability and to assess the reliability of the method by checking how well the method reproduces default values of activation energy used to generate the test glow curves. The activation energy values of the simulated glow-peaks were calculated using Eq.…”

“…(1) have been successfully applied to analyse glow-peaks [5]. Moreover, Rasheedy [6][7][8] has verified that the method successfully describes glow-curves that consist of one or more glow-peaks. Sunta et al [5] showed that methods based on Eq.…”

“…For the present work, the intensities I x , I y and I z are selected on the ascending part of the glow-peak, k is Boltzmann's constant; A x , A y and A z represent the areas under the glow-peak from T x to T f , T y to T f and T z to T f respectively where T f is the final temperature of the glow-peak. Details about the method have been discussed by Rasheedy [6][7][8].…”

“…This means that any analysis method that allows for free choice of data points from a glow-peak if applied to a region of a glow-peak with little or no distortion is likely to produce reliable kinetic parameters. With this justification, Rasheedy's proposed method [6][7][8] for calculating kinetic parameters uses three points each of which may be selected from any position on a glow-peak.…”

“…The aim of the present work is to apply the method proposed by Rasheedy [6][7][8] to calculate the activation energy in conditions where the retrapping probability is greater than the recombination probability and to assess the reliability of the method.…”