Sains Malaysiana 51(5)(2022): 1557-1566

http://doi.org/10.17576/jsm-2022-5105-23

Time-Temperature Profiles Effect on Thermoluminescence Glow Curve Formation of Germanium Doped Optical Fibres

(Kesan Profil Suhu Masa pada Pembentukan Lengkung Cahaya Termoluminesen bagi Gentian Optik Berdop Germanium)

MUHAMMAD SAFWAN AHMAD FADZIL^1,*, NORAMALIZA MOHD NOOR², NIZAM TAMCHEK³ & UNG NGIE MIN⁴

¹Diagnostic Imaging and Radiotherapy Program, Centre for Diagnostic, Therapeutic and Investigative Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 50300 Kuala Lumpur, Federal Territory, Malaysia

²Department of Radiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

³Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

⁴Clinical Oncology Unit, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia

Diserahkan: 5 Julai 2021/Diterima: 7 Oktober 2021

Abstract

The development of optical fibres technology grows in response to seeking a radiation detector with better thermoluminescence (TL) performance. Concerning the dosimetric characterization study by previous researchers, this research work has widened the exploration to optimize the time-temperature profile (TTP) in connection with the glow curve formation of the optical fibres. Two forms of germanium (Ge) doped optical fibres, namely cylindrical optical fibre (CF) and flat optical fibre (FF) were fabricated, and the TTP were investigated prior to commissioning the optical fibres for fieldwork. CF and FF were irradiated to the dose of 2 Gy using a 6 MV linear accelerator. Various TTP profiles, including preheat temperature, preheat time, acquisition temperature rate, and acquisition time were varied to determine the best thermal profile for the CF and FF based on the glow curve formations. Out of 4 parameters, an increase in preheat temperatures ranging from 40 to 120 °C caused a significant variation in the glow curve formation, thus possibly giving rise to different TL signals of the optical fibres. The maximum glow peak temperature of CF and FF was unvarying when different preheat temperatures employed. These findings support the conceptual idea that manipulating the optical fibres’ readout system can alter the glow curve formation. Thus, an optimized TTP will provide the correct glow curve configuration for kinetic parameter analysis.

Keywords: Optical fibres; thermoluminescence glow curve; time-temperature profiles

Abstrak

Pembangunan teknologi gentian optik berkembang sebagai gerak balas dalam mencari pengesan radiasi dengan prestasi pendar gerlap terma (TL) yang lebih baik. Merujuk kepada kajian pencirian dosimetrik oleh penyelidik terdahulu, penyelidikan ini telah memperluaskan penerokaan untuk mengoptimumkan profil suhu-masa (TTP) yang berkaitan dengan pembentukan lengkung cahaya daripada gentian optik. Dua bentuk germanium (Ge) dop gentian optik, iaitu gentian optik silinder (CF) dan gentian optik rata (FF) difabrikasi dan TTP dikaji sebelum gentian optik digunakan untuk kerja lapangan. CF dan FF disinari dengan dos radiasi 2 Gy menggunakan pemecut linear bertenaga 6 MV. Pelbagai profil TTP, termasuk suhu pra-pemanasan, tempoh masa pemanasan, kadar pemerolehan suhu dan masa pemerolehan diubah untuk menentukan profil terma yang terbaik untuk CF dan FF berdasarkan penghasilan lengkung berbara. Daripada 4 parameter, peningkatan suhu pra-pemanasan antara 40 hingga 120 °C menyebabkan variasi yang ketara dalam pembentukan lengkung berbara, dan ia akan menghasilkan isyarat TL yang berbeza daripada gentian optik. Suhu maksimum puncak berbara CF dan FF tidak berubah apabila suhu pra-pemanasan yang berbeza digunakan. Penemuan ini menyokong idea konseptual bahawa manipulasi terhadap sistem pembacaan gentian optik boleh mengubah pembentukan lengkung berbara. Oleh itu, TTP yang optimum akan menyediakan konfigurasi lengkung berbara yang tepat untuk analisa parameter kinetik.

Kata kunci: Gentian optik; lengkung berbarapendar gerlap terma; profil suhu-masa

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^*Pengarang untuk surat-menyurat; email: safwanfadzil@ukm.edu.my