Comparison of thermoluminescence response of different sized Ge-doped flat fibers as a dosimeter

Begum, Mahfuza Sharmila and Mizanur Rahman, A. K. M. and Abdul Rashid, Hairul Azhar and Yusoff, Zulfadzli and Mat Sharif, Khairul A. and Zulkifli, M. I. and Muhamad Yasin, S. Z. and Ung, Ngie Min and Kadir, A. B. A. and Mohd Amin, Yusoff and Bradley, David Andrew (2015) Comparison of thermoluminescence response of different sized Ge-doped flat fibers as a dosimeter. Radiation Physics and Chemistry, 116. pp. 155-159. ISSN 0969-806X

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Abstract

Prime dosimetric properties, including dose–response, linearity with dose, energy response, fading and threshold doses were investigated for three different dimension Ge-doped flat fibers. The results of measurement were also compared with two of the more commonly used standard TLD media, TLD-100 (LiF:Mg,Ti−7.5%6LiF) and TLD−700 (7LiF:Mg,Ti−99.9%7LiF) chips. The flat cross-section samples (60×180) µm2, (100×350) µm2 and (200×750) µm2 were fabricated using the Modified Chemical Vapor Deposition (MCVD) process and pulled from the same “preform.” In the study, all flat fiber samples provided good linear dose–response for the photon and electron beams generated using a medical linear accelerator (LINAC), for doses in the range 0.5–8 Gy. Among the samples, the smallest dimension flat fiber provided the best response, with a sensitivity of some 61% and 54%, respectively of that of the TLD-100 and TLD-700 chips. The energy responses of the samples were studied for various photon (6 MV, 10 MV) and electron (6 MeV, 9 MeV) beam energies. TL fading of around 20% was observed over a period of thirty (30) days. These favorable TL characteristics point towards promising development of Ge-doped flat fibers for use in radiotherapy dosimetry.

Item Type: Article
Uncontrolled Keywords: Thermoluminescence, Photon beam, Linear accelerator (LINAC), Ge-doped flat fiber, Threshold dose
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Nurul Iqtiani Ahmad
Date Deposited: 15 Apr 2015 04:24
Last Modified: 02 Feb 2017 08:30
URI: http://shdl.mmu.edu.my/id/eprint/6187

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