Citation

Bradley, D. A. and Lam, S. E. and Mat Nawi, Siti Nurasiah and Taheri, Ali and Abdul Sani, F. and Ung, Ngie Min and Alzimami, K. and Khandaker, Mayeen Uddin and Moradi, Farhad (2024) Graphite foils as potential skin and epithelium dosimeters at therapeutic photon energies. Applied Radiation and Isotopes, 210. p. 111371. ISSN 0969-8043

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Abstract

This work builds upon a prior study, examining the dosimetric utility of pencil lead and thin graphitic sheets, focusing upon the measurement of skin doses within the mammographic regime. In recognizing the near soft-tissue equivalence of graphite and the earlier-observed favourable thermoluminescence yield of thin sheets of graphite, this has led to present study of 50 μm thick graphite for parameters typical of external beam fractionated radiotherapy and skin dose evaluations. The graphite layers were annealed and then stacked to form an assembly of 0.5 mm nominal thickness. Using a 6 MV photon beam and delivering doses from 2- to 60 Gy, irradiations were conducted, the assembly first forming a superficial layer to a solid water phantom and subsequently underlying a 1.5 cm bolus, seeking to circumvent the build-up to electronic equilibrium for skin treatments. Investigations were made of several dosimetric properties arising from the thermoluminescence yield of the 50 μm thick graphite slabs, in particular proportionality and sensitivity to dose. The results show excellent sensitivity within the dose range of interest, the thermoluminescence response varying with increasing depth through the stacked graphite layers, obtaining a coefficient of determination of 90%. Acknowledging there to be considerable challenge in accurately matching skin thickness with dose, the graphite sheets have nevertheless shown considerable promise as dosimeters of skin, sensitive in determination of dose from the surface of the graphite through to sub-dermal depth thicknesses.

Item Type:	Article
Subjects:	Q Science > Q Science (General)
Depositing User:	Ms Nurul Iqtiani Ahmad
Date Deposited:	03 Jul 2024 01:44
Last Modified:	03 Jul 2024 01:44
URII:	http://shdl.mmu.edu.my/id/eprint/12561

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