A new method for obtaining the order of kinetics and the activation energy of the thermoluminescence glow peak

Abstract

The order of kinetics b of the thermoluminescence (TL) glow peak is usually determined once its symmetry factor µ g is known. In the present work, an equation is suggested to estimate directly the order of kinetics b of the glow peak. The value of b can be obtained by using the values of the temperatures T m (K), T 1 (K) and T 2 (K) at the maximum intensity and half maximum intensities of the peaks, respectively and the peak areas A m , A 1 and A 2 estimated from T m , T 1 and T 2 to the final temperature of the glow peak, respectively. Also, the activation energy E (eV) can be obtained after evaluating the order of kinetics b. The methods were checked for numerically computed TL glow peaks. The results are in good agreement with the given values of the order of kinetics b and activation energy E.

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.…”