Passive dosimetry of electron irradiated borosilicate glass slides

• Main Authors: Sani, Siti Fairus Abdul, Othman, Mohamad Habrul Ulum, Alqahtani, Amal, Nazeri, Ahmad Ali Z. Ahmad, Almugren, Khulud Saad, Ung, Ngie Min, Hashim, Siti Aiasah, Alkallas, Fatemah H., Bradley, Dora A.
• Format: Article
• Published: Elsevier 2021
• Subjects: QC Physics
• Online Access: http://eprints.um.edu.my/34268/

Thermoluminescence dosimetry most typically concerns the sensing and quantification of ionizing radiation exposures, with evaluation of absorbed dose arising from electron-hole trapping in well-disposed insulating/semi-conducting media. In this passive form of dosimetry the signal derives from photons released post-irradiation heating of the dosimeter over a specific temperature range. Herein, for entrance doses from 2 Gy up to 250 kGy, investigation is made of the thermoluminescence properties of electron irradiated borosilicate glass (SiO2-B2O3), the samples deriving from commercial microscope slides (coverslips) of thickness 1.0 mm. The coverslips provide linear TL response over a wide range of radiation dose, through use of a clinical linear accelerator in a lower dose regime (2-10 Gy) and use of a product-irradiation electron linac in a higher dose regime (25 kGy-250 kGy), obtaining a regression coefficient in excess of 96%. In the high dose regime comparison has been made with the response of Ge-B doped Flat Fibre (FF) and Ge-B doped photonic crystal fibre (PCF) (collapsed). Deconvolution shows the glow curves of the borosilicate glass to be formed of five overlapping peaks, with figures of merit (FOM) of between 0.62 - 1.72 and 0.87-1.00 for the particular dose ranges 2-10 Gy and 25 kGy-250 kGy respectively. Through use of Glowfit deconvolution software, the key trapping parameters of activation energy and frequency factor were calculated for the borosilicate glass slide.