title: The Thermoluminescence Response of Ge-Doped Flat Fibers to Gamma Radiation.
abstract: Study has been undertaken of the thermoluminescence (TL) yield of various tailor-made flat cross-section 6 mol% Ge-doped silica fibers, differing only in respect of external dimensions. Key TL dosimetric characteristics have been investigated, including glow curves, dose response, sensitivity, fading and reproducibility. Using a (60)Co source, the samples were irradiated to doses within the range 1 to 10 Gy. Prior to irradiation, the flat fibers were sectioned into 6 mm lengths, weighed, and annealed at 400 °C for 1 h. TL readout was by means of a Harshaw Model 3500 TLD reader, with TLD-100 chips (LiF:Mg, Ti) used as a reference dosimeter to allow the relative response of the fibers to be evaluated. The fibers have been found to provide highly linear dose response and excellent reproducibility over the range of doses investigated, demonstrating high potential as TL-mode detectors in radiation medicine applications. Mass for mass, the results show the greatest TL yield to be provided by fibers of the smallest cross-section, analysis indicating this to be due to minimal light loss in transport of the TL through the bulk of the silica medium.
authors: Radiation Research Laboratory, Department of Physics, Faculty of Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia. sitinurasiah@siswa.um.edu.my.
authors: Siti Nurasiah Binti Mat
authors: SN
authors: Nawi
authors: Radiation Research Laboratory, Department of Physics, Faculty of Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia. fadira@siswa.um.edu.my.
authors: Nor Fadira Binti
authors: NF
authors: Wahib
authors: Radiation Research Laboratory, Department of Physics, Faculty of Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia. najuazulkepely@um.edu.my.
authors: Nurul Najua Binti
authors: NN
authors: Zulkepely
authors: Radiation Research Laboratory, Department of Physics, Faculty of Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia. yusoffmohdamin@um.edu.my.
authors: Yusoff Bin Mohd
authors: YB
authors: Amin
authors: Department of Clinical Oncology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia. nm_ung@um.edu.my.
authors: Ung Ngie
authors: UN
authors: Min
authors: Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, Guildford GU2 7XH, UK. d.a.bradley@surrey.ac.uk.
authors: David Andrew
authors: DA
authors: Bradley
authors: Radiation Research Laboratory, Department of Physics, Faculty of Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia. rmdnor@um.edu.my.
authors: Roslan Bin Md
authors: RB
authors: Nor
authors: Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia. mjamil@um.edu.my.
authors: Mohd Jamil
authors: MJ
authors: Maah
mesh_terms: D004307:Dose-Response Relationship, Radiation; D005720:Gamma Rays; D005857:Germanium / Q000737:chemistry*; D049449:Luminescence; D055100:Optical Fibers; D015203:Reproducibility of Results; D013696:Temperature; D013819:Thermoluminescent Dosimetry
chemical_list: D005857:Germanium
keywords: dose response; flat fibers; glow curve; reproducibility; thermoluminescence