Sub kGy photon irradiation alterations in graphite

Bradley, D.A. * and Siti Nurasiah, M. N and Khandaker, Mayeen Uddin * and Almugren, K.S. and Abdul Sani, S.F. (2020) Sub kGy photon irradiation alterations in graphite. Applied Radiation and Isotopes, 161. p. 109168. ISSN 0969-8043

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Present work concerns polymer pencil-lead graphite (PPLG) and the potential use of these in elucidating irradiation-driven structural alterations. The study provides detailed analysis of radiation-induced structural interaction changes and the associated luminescence that originates from the energy absorption. Thermally stimulated emission from the different occupied defect energy levels reflects the received radiation dose, different for the different diameter PPLGs. The PPLG samples have been exposed to photon irradiation, specifically x-ray doses ranging from 1 to 10 Gy, extended to 30–200 Gy through use of a60Co gamma-ray source. Trapping parameters such as order of kinetics, activation energy and frequency factor are estimated using Chen's peak-shape method for a fixed-dose of 30 Gy. X-ray diffractometry was used to characterize the crystal structure of the PPLG, the aim being to identify the degree of structural order, atomic spacing and lattice constants of the various irradiated PPLG samples. The mean atomic spacing and degree of structural order for the different diameter PPLG are found to be 0.3332 nm and 26.6° respectively. Photoluminescence spectra from PPLG arising from diode laser excitation at 532 nm consist of two adjacent peaks, 602 nm (absorption) and 1074 nm (emission), with mean energy band gap values within the range 1.113–1.133 eV.

Item Type: Article
Uncontrolled Keywords: Luminescence; Polymer pencil-lead graphite; Trapping parameter; Photoluminescence spectroscopy; X-ray diffraction
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: 11 Nov 2021 07:45
Last Modified: 11 Nov 2021 07:45

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