Computerized glow curve deconvolution (CGCD): A comparison using asymptotic vs rational approximation in thermoluminescence kinetic models

M Wazir-Ud-Din; Shakeel Ur-Rehman; M Masood Mahmood; Khalil Ahmad; Sikander Hayat; M Tariq Siddique; M Basim Kakakhel; Sikander M Mirza

doi:10.1016/j.apradiso.2021.110014

Computerized glow curve deconvolution (CGCD): A comparison using asymptotic vs rational approximation in thermoluminescence kinetic models

Appl Radiat Isot. 2022 Jan:179:110014. doi: 10.1016/j.apradiso.2021.110014. Epub 2021 Nov 6.

Authors

M Wazir-Ud-Din¹, Shakeel Ur-Rehman², M Masood Mahmood¹, Khalil Ahmad¹, Sikander Hayat¹, M Tariq Siddique¹, M Basim Kakakhel¹, Sikander M Mirza¹

Affiliations

¹ Department of Physics & Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, 45650, Pakistan.
² Department of Physics & Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, 45650, Pakistan. Electronic address: shakeel@pieas.edu.pk.

PMID: 34785443
DOI: 10.1016/j.apradiso.2021.110014

Abstract

In this study an open-source tool GCD Analyzer, based on Microsoft® Excel, for Computerized Glow Curve Deconvolution analysis (CGCD) of thermoluminescence (TL) glow peak has been developed using a more accurate rational approximation. It is capable of deconvolution of glow curves having discrete or continuous trap distribution and can be used for routine as well as emergency radiation dosimetric analysis. This tool has a unique feature of TL glow curve analysis by combining discrete and continuous energy distributions for crystalline, amorphous, and mixed materials. To obtain best values of trap parameters like activation energy (E), frequency factor (s), order of kinetics (b), GCD Analyzer has the capability of analyzing glow curve using selectable individual peak of various physical kinetic models i.e. FOK, SOK, GOK, MOK, and Continuous Traps Distribution (CTD) with subtraction of optional background signal. The residual graph gives a clear visual understanding of the Figure of Merit (F.O.M). A comparison of asymptotic and rational approximation to the built-in second order exponential integral function E₂(E/KT) for E/KT < 600 is also presented. The results are verified by deconvolution of test synthetic glow curves with F.O.M up to 0.0005%, experimental glow curve for CTD with F.O.M of 0.9781%, and in the case of GLOWCANIN project glow curves, the F.O.M is comparable to the least values achieved by inter-comparison participants.

Keywords: Asymptotic approximation; Computerized glow curve deconvolution (CGCD); Continuous energy distribution; Discrete energy distribution; Rational approximation; Thermoluminescence (TL).