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Sains Malaysiana 49(8)(2020): 1981-1985
http://dx.doi.org/10.17576/jsm-2020-4908-20
Thermoluminescence Dosimetric
Characteristics of Fabricated Germanium (Ge) Doped Optical Fibres for Electron
Beams Dosimetry: A Preliminary Study
(Pencirian Dosimeter Pendar Gerlap Terma
terhadap Gentian Optik Dop Germanium yang Difabrikasi bagi Pengukuran Dos dalam
Pancaran Elektron: Sebuah Kajian Awal)
ZABARIAH ZAKARIA1,3, MOHD ZAHRI ABDUL AZIZ2 & NORAMALIZA MOHD NOOR*1,4
1Department of Imaging, Faculty of Medicine and Health Sciences, Universiti
Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
2Oncological and Radiological
Sciences Cluster, Advanced Medical and Dental
Institute (AMDI), Universiti Sains Malaysia (USM), 13200
Bertam, Pulau Pinang, Malaysia
3Universiti Kuala Lumpur British Malaysian Institute (UniKL BMI), Bt 8 Jalan Sg Pusu, 53100 Gombak, Selangor Darul Ehsan, Malaysia
4Department of Radiology,
Hospital Pengajar Universiti Putra Malaysia (HPUPM),
Persiaran Mardi-UPM,
Received: 2 October 2019/Accepted: 26 March 2020
ABSTRACT
The
basic dosimetric favourable responses of tailored fabricated germanium (Ge)
doped cylindrical optical fibres, make use of 2.3% mol have been extensively
studied with clinical electron beams irradiation in terms of dose linearity,
reproducibility, fading signals, minimum detectable dose (MDD), energy- and field
size dependence. The irradiation was performed at the Radiotherapy Unit,
Advanced Medical and Dental Institute (AMDI), which utilizes Elekta Synergy® linear accelerator (LINAC) at 6-, 9-, 12- and 15 MeV electron beam energies at
specific doses ranging from 1 to 5 Gy. Thermoluminescence (TL) signals
exhibited a linear dose-response overdose ranges, mean reproducibility with a
coefficient of variation (CV) of better than 10% and no dependency with
different field sizes at p > 0.05. The MDD values were typically 3.51 to
4.13 mGy. The minimum TL fading of the fabricated Ge-doped cylindrical optical
fibres was reported favourably for 9 MeV electron beam at day of 74.
Keywords: Dose linearity; optical fibres;
thermoluminescence (TL)
ABSTRAK
Pencirian asas yang sesuai terhadap tindak balas
germanium (Ge) dop gentian optik yang berbentuk silinder dengan kepekatan 2.3%
mol telah dikaji secara meluas dengan penyinaran pancaran elektron klinikal
dari segi kelinearan terhadap dos, kebolehulangan semula, kemerosotan isyarat, kebolehkesanan dos
radiasi minimum (MDD) dan kebergantungan kepada saiz medan dan tenaga.
Penyinaran ini telah dijalankan di Unit Radioterapi, Insititut Perubatan dan
Pergigian Termaju (IPPT) dengan menggunakan pemecut linear Elekta Synergy® dengan tenaga pancaran elektron iaitu 6-, 9-, 12- dan 15 MeV pada dos tertentu dengan penjulatan daripada 1 hingga 5 Gy. Isyarat pendar
gerlap terma (TL) telah menunjukkan gerak balas dos yang linear terhadap julat
dos, min kebolehulangan semula dengan pekali
variasi (CV) lebih baik daripada 10% dan tidak bergantung kepada perbezaan saiz
medan pada p > 0.05. Nilai kebolehkesanan dos
radiasi minimum biasanya daripada 3.53 hingga 4.13 mGy. Kemerosotan isyarat yang
minimum bagi gentian optik telah dilaporkan oleh pancaran
elektron yang bertenaga 9 MeV pada hari yang ke-74.
Kata kunci: Gentian optik; kelinearan dos; pendar
gerlap terma (TL)
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*Corresponding author; email: noramaliza@upm.edu.my
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