Thermoluminescence dosimetry and microstructural characteristics of gamma-irradiated natural flake graphite

Document Type

Article

Publication Date

8-1-2024

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.

Keywords

Natural flake graphite, Thermoluminescence, Dosimetry, Raman spectroscopy

Publication Title

Radiation Physics and Chemistry

Divisions

PHYSICS

Funders

Princess Nourah bint Abdulrahman University (PNURSP 2024R49)

Volume

221

Publisher

Elsevier

Publisher Location

THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

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