Advanced glow curve analysis of fabricated fibres for various sources of ionizing radiation
Document Type
Article
Publication Date
1-1-2021
Abstract
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.
Keywords
Glow curve deconvolution, Ge-doped fabricated fibres, Kinetic parameters
Divisions
PHYSICS
Funders
FRGS Grant from Ministry of Higher Education Malaysia [Grant No: FRGS/1/2018/STG02/UPM/02/7]
Publication Title
Radiation Physics and Chemistry
Volume
178
Issue
SI
Publisher
Pergamon-Elsevier Science Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND