Sains Malaysiana 53(6)(2024): 1377-1387
http://doi.org/10.17576/jsm-2024-5306-12
Characterization and Correction of
Fading Effects in GeDOFs Microdosimeter for Absorbed Dose Measurements
(Pencirian dan Pembetulan Kesan Pudar dalam Mikrodosimeter GeDOFs untuk Pengukuran Dos Serap)
NORAMALIZA MOHD NOOR1, NIZAM
TAMCHEK2, UNG NGIE
MIN3, MOHD TAUFIK
DOLAH4 & MUHAMMAD
SAFWAN AHMAD FADZIL5,*
1Department of Radiology,
Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
2Department of Physics,
Faculty of Science, Universiti Putra Malaysia, 43400
UPM Serdang, Selangor, Malaysia
3Clinical Oncology Unit,
Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
4Radiation Safety and Health
Division, Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor, Malaysia
5Diagnostic Imaging and
Radiotherapy Program, Centre for Diagnostic, Therapeutic and Investigative
Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
Diserahkan: 8 Oktober 2023/Diterima: 2 Mei 2024
Abstract
This study investigates the thermoluminescence (TL) fading of fabricated
germanium-doped optical fibers (GeDOFs)
with a focus on TL signal intensity, glow curve, best-fit curve, and correction
factor. Two distinct GeDOFs geometries, cylindrical fiber (CF) and flat fiber (FF),
were compared for TL intensity decay under 6 MV and 10 MV photon beams. TL
intensity measurements were recorded from the first day post-irradiation to the
106th day and a comparison of two fading curve-fitting approaches
was carried out. Fading correction factor () was derived, and the corresponding
uncertainties were calculated. Over time, GeDOFs exhibited a decline in TL
intensity, with a notably rapid decay occurring in the initial 30 days after
irradiation. The most substantial TL intensity loss was observed in FF, with
values of 58.9% for 6 MV and 63.4% for 10 MV. The evaluation of curve fitting
showed that the best conformity was achieved through a single exponential decay
equation model. The area under the glow curve decreased as the time between GeDOFs irradiation and TL readout increased. was determined by comparing the fading
function of reference GeDOFs to that of the measured ones. The estimated
uncertainties associated with
were found to be 0.06% for CF and 0.12% for
FF, respectively. GeDOFs exhibit fading characteristics influenced by TL
readout interval time and radiation energy. When quantifying the absorbed dose
from photon beams, it is crucial to account for the fading correction factor to
ensure the precise and accurate measurement of the dose.
Keywords:
Correction factor; dosimetry audit; fading; Ge-doped optical fibres
Abstrak
Kajian ini meneliti kemerosotan termopendarcahaya (TL) gentian optik dop Ge yang difabrikasi (GeDOFs) dengan tumpuan diberikan kepada keamatan isyarat TL, lengkungan bara, lengkungan padanan terbaik dan faktor pembetulan. Dua geometri GeDOFs yang berbeza, gentian silinder (CF) dan gentian leper (FF) dibandingkan tahap kemerosotan keamatan TL di bawah sinaran foton 6 MV dan 10 MV. Pengukuran keamatan TL direkodkan dari hari pertama selepas penyinaran hingga hari ke-106 dan perbandingan antara dua pendekatan padanan lengkungan kemerosotan telah dijalankan. Faktor pembetulan kemerosotan signal (
) diterbitkan dan ketidakpastian yang berkaitan telah dihitung. Seiring berjalannya masa, GeDOFs menunjukkan penurunan keamatan TL dengan kemerosotan yang ketara berlaku dalam tempoh 30 hari pertama selepas penyinaran. Kehilangan keamatan TL yang paling ketara diperhatikan pada FF, dengan nilai pengurangan sebanyak 58.9% untuk 6 MV dan 63.4% untuk 10 MV. Penilaian padanan lengkungan menunjukkan bahawa padanan terbaik dicapai melalui model persamaan kemerosotan eksponensial tunggal. Kawasan di bawah lengkungan bara berkurang apabila masa antara penyinaran GeDOFs dan pembacaan TL meningkat.
ditentukan dengan membandingkan fungsi kemerosotan
signal GeDOFs rujukan dengan yang diukur. Anggaran ketidakpastian yang
berkaitan
berada pada kadar 0.06% untuk CF dan 0.12% untuk FF. GeDOFs menunjukkan ciri kemerosotan signal yang dipengaruhi oleh selang masa bacaan TL dan tenaga sinaran. Apabila mengukur dos terserap daripada sinaran foton, adalah penting untuk mempertimbangkan faktor pembetulan kemerosotan signal untuk memastikan pengukuran dos yang tepat.
Kata kunci: Audit dosimetri; faktor pembetulan; gentian optik dop Ge; kemerosotan signal
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*Pengarang untuk surat-menyurat;
email: safwanfadzil@ukm.edu.my
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