Ismail, Sharifah Shafiqah and Sani, Siti Fairus Abdul and Khandaker, Mayeen Uddin and Tamchek, Nizam and Karim, Julia Abdul and Almugren, Kholud S. and Alkallas, Fatemah Homoud and Shafiqah, A.S. Siti and Bradley, Dora A. (2022) Dosimetric characteristics of Gd-doped silica glass subjected to neutron and gamma irradiations. Applied Radiation and Isotopes, 189. ISSN 0969-8043, DOI https://doi.org/10.1016/j.apradiso.2022.110409.
Full text not available from this repository.Abstract
The dosimetric characteristics of newly developed gadolinium (Gd) glass dosimeter produced via sol-gel method are reported. Irradiation were made using a 750 kW neutron flux thermal power and 1.25 MeV 60Co gamma rays with entrance doses from 2 to 10 Gy. Investigation has been done on various Gd dopant concentrations, ranging from 1 to 10 mol%. The Gd-doped silica glass have been characterised for thermoluminescence (TL) dose response, sensitivity, linearity index, glow curve and kinetic parameter analysis. For particular dopant concentration obtained in 6 mol% Gd, the least squares fit shows the change in TL yield, correlation coefficient (r2) of better than 0.980 (at 95% confidence level), with neutron and gamma exposure to be 8 and 4 times greater than that of 1 mol% Gd, respectively. Broad peaks in the absence of any sharp peak observed in the glow curve confirms the amorphous nature of the prepared glass. A glow curve of Gd-doped SiO2 sample is observed with a single prominent peak (T-m) within 200-250 ?C (peak shifting appears with respect to the increment of dopant concentration) and 350 ?C (for all respective Gd dopants) for neutron and gamma irradiations, respectively. Deconvolution shows the glow curves of the Gd-doped SiO2 glass to be formed of seven and five overlapping peaks, with figures of merit below 2% (FOM) of between 1.38-1.79 and 1.30-1.97 for the particular neutron and gamma irradiations, respectively. Through use of Glowfit deconvolution software, the key trapping parameters of activation energy, E and frequency factor, s(- 1 )were calculated for the Gd-doped SiO(2 )glass. The mechanism of TL yield with the gradual increase in Gd concentrations and doses is explained upon the incorporation of Gd and radiation damage that change the structure of the electron traps in the glass matrix. These early results indicate that selectively screened Gd-SiO2 glass can be developed into a promising TL system towards dosimetric applications.
| Item Type: | Article |
|---|---|
| Funders: | Princess Nourah bint Abdulrahman University [(RGP-1440-0016) (2)], Sunway University, Malaysia [PGSUREC2020/012] |
| Uncontrolled Keywords: | Dosimetry; Gd-doped silica; Gamma; Neutron; Sol gel; Thermoluminescence |
| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
| Divisions: | Faculty of Science |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 12 Sep 2023 01:49 |
| Last Modified: | 17 Sep 2024 07:27 |
| URI: | http://eprints.um.edu.my/id/eprint/41165 |
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