Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
Also available in printed version : QC479 S66 2014 raf
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| Format: | Master's thesis |
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Universiti Teknologi Malaysia
2025
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| Online Access: | https://utmik.utm.my/handle/123456789/104521 |
| Abstract | Abstract here |
| _version_ | 1854975104139657216 |
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| author | Siti Nurbayah Buang |
| author2 | Suhairul Hashim, supervisor |
| author_facet | Suhairul Hashim, supervisor Siti Nurbayah Buang |
| author_sort | Siti Nurbayah Buang |
| description | Also available in printed version : QC479 S66 2014 raf |
| format | Master's thesis |
| id | utm-123456789-104521 |
| institution | Universiti Teknologi Malaysia |
| publishDate | 2025 |
| publisher | Universiti Teknologi Malaysia |
| record_format | dspace |
| record_pdf | Abstract |
| spelling | utm-123456789-1045212025-08-21T10:12:48Z Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation Siti Nurbayah Buang Suhairul Hashim, supervisor Thermoluminescence Also available in printed version : QC479 S66 2014 raf This study was focused on the suitability of commercial optical fibres as a new thermoluminescence dosimeter (TLD). The materials doped to silicon dioxide (SiO2) were germanium type A (Ge (A)) of first, second and third batch, germanium type B (Ge (B)), erbium (Er), aluminium and thulium (Al + Tm), photonic crystal fibre (PCF) of first and second batch, and multi photonic crystal fibres (MPCF). The MPCF came with different range of core diameter of 220 µm (MPCF 220 µm) and 2 mm (MPCF 2 mm). The study also used pure glasses such as photosensitive flat fibre (PFF), flat fibre (FF) and dummy flat fibre (DFF). A comparison of the thermoluminescence (TL) response of electron irradiation concerning sensitivity, linearity, energy dependence, fading signal, reproducibility, minimum detectable dose (MDD) and effective atomic number, Zeff parameters as well as cross-comparison with that of TL dosimeter i.e TLD-100 (LiF:Mg,Ti) rods were investigated. Scanning electron microscopy (SEM) was used to determine the dopant concentration in each doped optical fibres. The irradiation was performed using 6 MeV electrons for doses ranging from 1 – 4 Gy at Pantai Hospital and University of Malaya Medical Centre separately according to the batch. All the optical fibres produced linear dose-TL responses for dose range of 1 – 4 Gy. TLD-100 produced greater TL sensitivity followed by PFF, FF, Ge (A), MPCF 2 mm, DFF, Al + Tm, Er, MPCF 220 µm, Ge (B) and PCF with their relative sensitivity of 0.2, 0.15, 0.08, 0.04, 0.02, 0.01, 0.005, 0.004, 0.003 and 0.002 respectively compared to TLD-100. Ge (A) showed 7% signal loss followed by PFF, Er, FF and PCF with 15%, 26%, 28% and 33% signal loss respectively after 14 days of irradiation. Reproducibility of Ge (A), Ge (B), Er, PCF, MPCF 2 mm and MPCF 220 µm were poor due to high degree of fading. The lowest MDD obtained from TLD-100, followed by FF, Ge (A) 1st batch, Ge (A) 3rd batch and PFF with their MDD of 0.13, 0.9, 4.0, 5.2 and 5.4 mGy respectively. The Zeff for Ge (B), Ge (A) and Er doped to SiO2 optical fibres were 11.88, 12.95 and 20.69 respectively. Several attractive features offered by these fibres point to its use in radiation therapy atiff UTM 135 p. Thesis (Sarjana Sains (Fizik)) - Universiti Teknologi Malaysia, 2014 2025-04-10T07:26:46Z 2025-04-10T07:26:46Z 2014 Master's thesis https://utmik.utm.my/handle/123456789/104521 valet-20160324-173429 vital:85431 Closed Access UTM Complete Unpublished application/pdf Universiti Teknologi Malaysia |
| spellingShingle | Thermoluminescence Siti Nurbayah Buang Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation |
| thesis_level | Master |
| title | Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation |
| title_full | Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation |
| title_fullStr | Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation |
| title_full_unstemmed | Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation |
| title_short | Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation |
| title_sort | thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation |
| topic | Thermoluminescence |
| url | https://utmik.utm.my/handle/123456789/104521 |
| work_keys_str_mv | AT sitinurbayahbuang thermoluminescenceresponseofdopedsilicondioxideopticalfibressubjectedtoelectronirradiation |