Godwin, Efenji Irinam (2025) Development Of Aluminium-Lithium-Zinc Oxide Borate Glass Activated With Dysprosium (Dy+3) For Enhanced Radiation Dosimetry Applications. PhD thesis, Perpustakaan Hamzah Sendut.
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Abstract
In this study, dy³⁺-doped aluminium–lithium–zinc borate glass has been formulated as a viable substitute for traditional thermoluminescent dosimeters, providing superior sensitivity, stability, and adjustable optical characteristics for accurate radiation dose assessment. In contrast to the often-utilised lif: mg, ti and caso₄:dy systems, this glass system integrates a customised borate network with rare-earth activation to attain a distinctive equilibrium of minimal fading, extensive dosage linearity, and strong thermal stability. This study involved the production of glass using the melt-quenching technique, followed by a thorough characterisation of its physical, optical, and thermoluminescent properties, with results compared to commercial dosimetry materials. The fabricated glass yields a material with a molar volume of 29.78 cm3/mol. And a density of 2.675 gcm3⁄. The direct and indirect bandgaps range was 1.8 ev to 5.2 ev and 1.3 ev to 3.7 ev, respectively. The thermal stability of the al-li-zn borate glass samples was shown by thermogravimetric analysis (tga), proving their appropriateness for radiation dosimetry applications. Its usefulness for radiation dosimetry was further reinforced by effective atomic numbers of 9.3 and 7.3, respectively. Images obtained using field emission scanning electron microscopy (fesem) demonstrated a distinct structure with identical particle distribution. The chemical structure of the glass was revealed by fourier-transform infrared (ftir) spectroscopy, which showed prominent peaks linked to oh groups, bo3, and bo4 units.
| Item Type: | Thesis (PhD) |
|---|---|
| Subjects: | Q Science > QC Physics > QC1 Physics (General) |
| Divisions: | Pusat Pengajian Sains Fizik (School of Physics) > Thesis |
| Depositing User: | Mr Hasmizar Mansor |
| Date Deposited: | 30 Jun 2026 01:37 |
| Last Modified: | 30 Jun 2026 01:37 |
| URI: | http://eprints.usm.my/id/eprint/64511 |
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