Characterization of a promising luminescence-based graphite radiation dosimeter

Nawi, Siti Nurasiah Mat and Khandaker, Mayeen Uddin and Bradley, D. A. and Sani, S. F. Abdul and Al-mugren, K. S. (2021) Characterization of a promising luminescence-based graphite radiation dosimeter. Radiation Physics and Chemistry, 188. ISSN 0969-806X, DOI

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Characterization has been undertaken of the thermoluminescence (TL) properties of 0.3 mm polymer pencil lead graphite (PPLG). For 60Co gamma irradiation doses from 0.5 Gy up to 20 Gy readout data have been taken at different heating rates, from 2 to 15 degrees C s-1, linear TL responses with radiation dose being found, also with a greater degree of sensitivity at the lowest dose. Estimation has been made of the principal trap parameters of the PPLG, use being made of the variable heating rate method via the Hoogenstraaten, Booth - Bohun - Parfianovitch and Two Point Two Heating Rate techniques. Among the trap parameters are included the order of kinetics, activation energy, the frequency factor, and the initial concentration of trapped electrons. Also determined are relations that allow estimation of the temperature lag between the heating element and that of the sample. The stability of TL signal has been examined at peak temperatures with the lifetime of the TL glow peak calculated. Structural alterations of the irradiated PPLGs have been observed via Raman and Photoluminescence (PL) spectroscopy, also via X-ray diffraction (XRD), providing information on physical parameters relating to the defects participating in the luminescence process. The results indicate 0.3 mm PPLG to offer promising potential as a new generation of radiation dosimeter, including for medical radiation applications.

Item Type: Article
Funders: Sunway University Research Grant (INT-2019-SHMS-CBP-02), Deanship of Scientific Research at Princess Nourah bint AbdulRahman University, Riyadh, through the Research Group Program Grant (RGP-1440-0016)
Uncontrolled Keywords: Kinetic parameters; Activation energy; Variable heating rate method; X-ray diffraction; Raman and photoluminescence spectroscopy
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 10 Mar 2022 02:32
Last Modified: 10 Mar 2022 02:32

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