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https://ptsldigital.ukm.my/jspui/handle/123456789/500216Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Irman Abdul Rahman, Assoc. Prof. Dr. | - |
| dc.contributor.author | Muhammad Taqiyuddin Mawardi Ayob (P69833) | - |
| dc.date.accessioned | 2023-10-13T09:39:56Z | - |
| dc.date.available | 2023-10-13T09:39:56Z | - |
| dc.date.issued | 2019-06-03 | - |
| dc.identifier.other | ukmvital:110774 | - |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/500216 | - |
| dc.description | A series of the radio-photoluminescent glass dosimeters (RPLGDs) with different ratios of chemical composition in the glass were successfully prepared using the wet melting method. RPLGDs are applicable for measurement of ionizing radiation doses using silver-doped phosphate glass. When the RPLGD is exposed to γ-rays, electrons/holes produced by the γ-radiation are trapped by the Ag+ ions, producing Ag° and Ag2+ ions respectively, resulting in the emission of two RPL peaks at 460 and 620 nm. There were three main parts to this study which includes; 1) the silver nanoparticles (AgNPs) preparation, 2) formation of glasses with different ratios of chemical elements and 3) development of the RPLGD using the optimum ratio of chemical element composition with AgNPs. In this work, AgNPs with different sizes were prepared by polyol method with citrate as a capping agent. The basic physical and optical properties of the glasses, such as hardness, density, transmission, absorbance and photoluminescence values were analysed. The optimal composition range of phosphate glasses for RPLGDs was also investigated. The effect of AgNPs addition on the phosphate glass composition, microstructure, optical and chemical characteristics was investigated using Energy-dispersive X-ray spectroscopy, X-ray diffraction, photoluminescence spectroscopy and Fourier transform infrared. The addition of protic polyethyleneimine and aprotic poly(sodium 4-styrene sulfonate) polymers produces AgNPs with smaller dimensions of approximately ~17 nm and ~2 nm, respectively. The correlation between the RPLGD properties investigated and the glass compositions showed that the characteristic properties were dependant on the ratio of chemical composition used. The photoluminescence study of AgNPs-doped phosphate glass with 40 nm and 90 nm of AgNPs showed enhanced radiation sensitivity towards γ-radiation compared with phosphate glass doped with bulk silver under the same conditions. All AgNPs sample with 4.3 wt% showed the highest γ-ray detection sensitivity, which showed the highest PL peaks at the same absorbed dose, followed by 2.5 wt% and 7.7 wt%. In conclusion, using AgNPs as activators in the RPLGD will enhance the radiation sensitivity due to the rapid and excellent growth of the RPL centers within the forbidden band of the glass formed by the initial ionizing event.,Certification of Master's/Doctoral Thesis is not available,Ph.D. | - |
| dc.language.iso | eng | - |
| dc.publisher | UKM, Bangi | - |
| dc.relation | Faculty of Science and Technology / Fakulti Sains dan Teknologi | - |
| dc.rights | UKM | - |
| dc.subject | Dosimeters | - |
| dc.subject | Photoluminescence | - |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | - |
| dc.subject | Dissertations, Academic -- Malaysia | - |
| dc.title | Development of silver nanoparticles-doped phosphate glasses for radio-photoluminescence glass dosimeter (RPLGD) | - |
| dc.type | Theses | - |
| dc.format.pages | 178 | - |
| dc.identifier.callno | QC795.5.M848 2019 tesis | - |
| dc.identifier.barcode | 004155(2019) | - |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_110774+SOURCE1+SOURCE1.0.PDF Restricted Access | 1.26 MB | Adobe PDF |  View/Open |
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