Studies of thermoluminescence kinetic parameters of polymer pencil lead graphite under photon exposures

• Published in: Applied radiation and isotopes 2021-08, Vol.174, p.109757-109757, Article 109757
• Main Authors: Khandaker, Mayeen Uddin, Mat Nawi, Siti Nurasiah, Bradley, David Andrew, Lam, Siok Ee, Abdul Sani, Siti Fairus, Sulieman, Abdelmoneim
• Format: Article
• Language: English
• Subjects: Activation energy; Kinetic parameters; Thermoluminescence; Three-point analysis method
• ISSN: 0969-8043; 1872-9800
• DOI: 10.1016/j.apradiso.2021.109757

This study analysed thermoluminescence (TL) glow curves of the polymer pencil lead graphite (PPLG) due to its potential applications in radiation dosimetry. The TL glow curves provide information on the physical parameters of the defects participating in luminescence process. The glow curves for different diameters PPLG samples were obtained with varying temperature from 50 to 300 °C, at a fixed heating rate of 10 °Cs−1. A number of methods (initial rise, peak shape and curve fitting) were used to fit the TL glow peaks of the PPLG samples obtained under photon dose of 200 Gy. From the fitted TL signals, the trap parameters such as the order of kinetics, the activation energy, the frequency factor, etc. for the individual peaks were numerically determined. The lifetimes of TL process were calculated assuming the first-order kinetics. The results are compared among the different methods adopted in this study. Implications about the possible results in glow curve deconvolution are discussed. •Novel use of polymer pencil-lead graphite (PPLG) for radiation dosimetry.•TL Kinetic parameters of PPLG are studied for the first time using various techniques.•Principal trapping parameters are evaluated and compared among different methods.•The data suggest that the TL glow peaks of the PPLG obey general-order kinetics.