Thermoluminescence Response and Kinetic Parameters of Copper-Doped Lithium Borate Glass Dosimeters for Medical Radiation Mapping

International Journal of Physics | Vol. 2, No. 11, November 2011 | pp. 84–91

DOI: 10.46882/2011/IJP/000023

Article Type: Original Research Paper

Title: Thermoluminescence Response and Kinetic Parameters of Copper-Doped Lithium Borate Glass Dosimeters for Medical Radiation Mapping

Names of Authors: S. A. Jonah¹, A. M. El-Sayed²

Authors’ Affiliations: ¹Centre for Energy Research and Training, Ahmadu Bello University, Zaria, Nigeria; ²Department of Physics, Ain Shams University, Cairo, Egypt

Abstract: Accurate radiation dosimetry is critical in clinical radiotherapy to maximize tumor destruction while minimizing exposure to surrounding healthy tissues. This study evaluates the thermoluminescence (TL) characteristics of lithium borate (Li₂B₄O₇) glasses doped with copper impurities (0.1% to 0.5% mol) synthesized via melt-quench configurations. The fabricated glass samples were exposed to medical gamma rays from a Co-60 source across a dose range spanning 0.5 Gy to 50 Gy. The TL glow curves, measured at a constant heating rate of 5 K/s, displayed a well-defined, prominent dosimetric peak centered at 485 K. Computerized glow curve deconvolution (CGCD) methods were utilized to extract the defect trapping parameters. The analysis revealed second-order kinetic behavior with an activation energy of 1.12 eV and a frequency factor of 2.5 x 10¹¹ s⁻¹. The TL peak intensity displayed a linear response to radiation up to 25 Gy before exhibiting minor saturation tendencies. The fading rate was assessed at less than 4.5% over a 30-day storage period at room temperature. These stable characteristics indicate that copper-doped lithium borate glass serves as an effective, tissue-equivalent matrix for personal and clinical radiation monitoring.

Keywords: Thermoluminescence; Lithium borate glass; Radiotherapy dosimetry; Activation energy; Glow curve deconvolution; Trapping kinetics; Gamma radiation; Personal monitoring.

Manuscript Timeline: Received: August 02, 2011; Revised: September 15, 2011; Accepted: October 10, 2011; Published: November 05, 2011.

Citation: Jonah, S. A., & El-Sayed, A. M. (2011). Thermoluminescence Response and Kinetic Parameters of Copper-Doped Lithium Borate Glass Dosimeters for Medical Radiation Mapping. International Journal of Physics, 2(11), 84–91.

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