Advanced glow curve analysis of fabricated fibres for various sources of ionizing radiation

Kandan, V. and Hassan, M. F. and Omar, N. and Shahar, H. K. and Mohamad, F. and Karim, M. K. Abdul and Sani, S. F. Abdul and Bradley, D. A. and Noor, N. Mohd (2021) Advanced glow curve analysis of fabricated fibres for various sources of ionizing radiation. Radiation Physics and Chemistry, 178 (SI). ISSN 0969-806X, DOI

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Determination is made of glow curves attributes of Ge-doped silica fibres fabricated from Ge-doped preforms. In particular interest is in Ge-doped cylindrical (Ge-CF) and Ge-doped flat (Ge-FF). The fabrications are irradiated using various ionizing radiation sources types, protons (150 MeV, 210 MeV), 6 and 10 MV photons, 6 MeV electrons, and Co-60 gammas (mean energy 1.25 MeV), all at a constant dose of 5 Gy. The fibres have been fabricated using the MCVD technique, notably with a Ge-CF having a larger core compared to the commercial cylindrical fibres (CF). Using WinGCF software the glow curves have been deconvolved, revealing five contributory glow peaks, evaluation being made of three kinetic parameters: maximum temperature (T-max), activation energy (E-a) and peak integral (PI). Ge-CF E-a and PI values are found to be greater than those for Ge-FF. Moreover, for Ge-CF, the activation energy for electromagnetic irradiation (gamma photons) achieves a maximum reading at peak number 3 while its PI is found to be the least. The PI for photon irradiation is shown to be greater than that for electron and proton irradiation. For Ge-FF, E-a again achieves its greatest value at peak 3, the PI being maximum at peak 2 and least at peak 3. Particle irradiations are more greatly associated with deeper trapping levels. Additionally, the overall conclusion is that Ge-CF offers superior TL yield to that of Ge-FF. One-way analysis of variance (ANOVA) for the individual peaks shows there to be significant differences in terms of PI and E-a, p < 0.05 for all types of radiation, but weakly significant in terms of T-max for both types of fibres (p < 0.05), mostly for proton and photon irradiation.

Item Type: Article
Funders: FRGS Grant from Ministry of Higher Education Malaysia [Grant No: FRGS/1/2018/STG02/UPM/02/7]
Uncontrolled Keywords: Glow curve deconvolution; Ge-doped fabricated fibres; Kinetic parameters
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms Zaharah Ramly
Date Deposited: 13 Jun 2022 08:10
Last Modified: 13 Jun 2022 08:10

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