Polymer pencil lead graphite for in vivo radiation dosimetry

Siti Nurasiah, M. N. and Khandaker, Mayeen Uddin * and Bradley, D.A. * and Sani, S.F. A. and Almugren, K.S. and Sulieman, Abdelmoneim (2020) Polymer pencil lead graphite for in vivo radiation dosimetry. Diamond and Related Materials, 106. p. 107860. ISSN 0925-9635

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Official URL: http://doi.org/10.1016/j.diamond.2020.107860


This work explores the use of polymer pencil‑lead graphite (PPLG) as a novel material for passive radiation dosimetry, analysis including state-of-the-art techniques. The versatility of carbon materials in such applications arises in great part from the strong dependence of their physical properties on the ratio of sp2 (graphite-like) to sp3 (diamond-like) bonds. Investigation has been made of key dosimetric properties of commercially available PPLG, specifically the thermoluminescence (TL) glow curve, dose response, energy dependence, effective atomic number, sensitivity and fading. Four different diameter PPLG rods have been studied, their response to photon irradiations being examined. The PPLGs have been found to provide good linear response within the dose range 10 to 200 Gy, sensitivity increasing inversely with PPLG rod diameter. With a standard deviation <3%, all samples showed excellent reproducibility. The fading study was also calculated, the stability of TL signal being examined at room temperatures in dark condition. Vibrational spectra of the irradiated PPLGs were determined using a 532 nm laser Raman spectrometer while bulk resistance, an indirect measure of dosimetry, was studied via electrochemical impedance spectroscopy. The various dose response evaluations reveal the 2B hardness polymer pencil‑lead to possess favourable dosimetric features, suited to passive sensing of radiation for a range of ionizing radiation applications, medical and sterilizational work included.

Item Type: Article
Uncontrolled Keywords: Polymer pencil-lead graphite; Photon irradiation; Thermoluminesce dosimetry; Defect characterization; Bulk conductivity
Subjects: R Medicine > R Medicine (General) > R895-920 Medical Physics/Medical Radiology
Divisions: Others > Non Sunway Academics
Sunway University > School of Engineering and Technology [formerly School of Science and Technology until 2020] > Research Centre for Applied Physics and Radiation Technologies
Depositing User: Dr Janaki Sinnasamy
Related URLs:
Date Deposited: 17 Nov 2021 02:43
Last Modified: 17 Nov 2021 02:43
URI: http://eprints.sunway.edu.my/id/eprint/1622

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