Khandaker, Mayeen Uddin and Lam, Siok Ee and Daud, Amirul Najman Ariff Md and Sani, Siti Fairus Abdul and Bradley, David Andrew and Alzimami, Khalid S. and Almohammed, Huda I. and Hamd, Zuhal Y. and Osman, Hamid (2024) Thermoluminescence dosimetry and microstructural characteristics of gamma-irradiated natural flake graphite. Radiation Physics and Chemistry, 221. p. 111794. ISSN 0969-806X, DOI https://doi.org/10.1016/j.radphyschem.2024.111794.
Full text not available from this repository.Abstract
Thermoluminescence (TL) and microstructural analysis were conducted on natural flake graphite (NFG) to assess its suitability for radiotherapeutic x-ray dose measurements. The investigations encompassed the examination of TL glow curves, linearity, sensitivity, signal decay, and repeatability. NFG samples were exposed to Co-60 gamma radiation doses ranging from 2 Gy to 20 Gy. The microstructure of the irradiated NFG was probed using a 532 nm laser Raman spectrometer. Promisingly, the NFG exhibited remarkable characteristics, including a moderately higher response to dose (R-2 of about 96%), increased sensitivity at lower doses, and good repeatability (similar to 4%). Nevertheless, its fading rate reached about 80% after 14 days of irradiation. Additionally, the NFG intensity ratios of defect (D) to graphite (G), denoted as I-D/I-G, closely mirrored the oscillatory pattern observed in 50 mu m thick graphite sheets and were approximately 1.6 times lower than those of similar graphite sheets with comparable carbon content (about 98% carbon). These findings suggest that NFG holds potential for the development of an affordable, non-hygroscopic, and tissue-equivalent TL dosimeter, with possible applications in the medical field.
| Item Type: | Article |
|---|---|
| Funders: | Princess Nourah bint Abdulrahman University (PNURSP 2024R49) |
| Uncontrolled Keywords: | Natural flake graphite; Thermoluminescence; Dosimetry; Raman spectroscopy |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 18 Sep 2024 00:22 |
| Last Modified: | 18 Sep 2024 00:22 |
| URI: | http://eprints.um.edu.my/id/eprint/45114 |
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