The Thermoluminescence Response of Ge-Doped Flat Fibers to Gamma Radiation

• Published in: Sensors (Basel, Switzerland) Vol. 15; no. 8; pp. 20557 - 20569
• Main Authors: Nawi, Siti Nurasiah Binti Mat, Wahib, Nor Fadira Binti, Zulkepely, Nurul Najua Binti, Amin, Yusoff Bin Mohd, Min, Ung Ngie, Bradley, David Andrew, Nor, Roslan Bin Md, Maah, Mohd Jamil
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI 20.08.2015; MDPI AG
• Subjects: dose response; Dose-Response Relationship, Radiation; flat fibers; Gamma Rays; Germanium - chemistry; glow curve; Luminescence; Optical Fibers; reproducibility; Reproducibility of Results; Temperature; thermoluminescence; Thermoluminescent Dosimetry; flat fibers; thermoluminescence; dose response; glow curve; reproducibility
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s150820557

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.