Glow Peak Analysis Of Pure And Ge-Doped Silica Flat Fiber At Ultra High Dose Electrons
| dc.contributor.author | Ariffin, Alawiah | |
| dc.date.accessioned | 2016-10-24T07:07:32Z | |
| dc.date.available | 2016-10-24T07:07:32Z | |
| dc.date.issued | 2015-07 | |
| dc.description.abstract | Silica flat fiber (FF) is being proposed as the basis for a novel radiation sensor of the thermoluminescence (TL) produced. The TL performance of the FFs and its respective glow curves were studied using a linear accelerator (LINAC) delivering doses of clinical radiotherapy within the range of 0.2-10.0 Gy. An electron accelerator (Alurtron®) was used to deliver the ultra-high dose. The TL dose response, dopant effect, heating rate effect and kinetic parameters of the deconvoluted glow peaks were investigated. The glow curve of FFs shifted to the higher temperature region as the heating rate increases. The kinetic parameters show dependence on the heating rate for both doped and un-doped FFs. It is found that the Burlin Cavity Theory (BCT) fit model can be used to predict the energy response of FF, accurately. Increasing the dopant concentration between 0 and 6 wt % Ge in FFs, increases the linearity index, f D by 2.0. These remarkable findings showed the effect of dopant quenching in FF as the Ge dopant concentration was increased up to 8 wt%. The TL sensitivity of 6 wt% Ge doped FF was found to be 3.5 higher as compared to pure silica FF. Also noted, all peaks tend to show the first-order kinetics behavior within the linear dose range of 0.1 - 10 Gy. The maximum supralinearity of FFs found to be at ~30 kGy. No saturation occurred at f(D)max and further increases of dose up to 1 MGy, exhibits a significant decrease in f(D). The TL kinetic model can be used to explain the TL glow peak before the critical dose limit was achieved whereas none of TL model can explain the strange changes in TL glow peak at doses > 10 kGy up to 1 MGy. Overall results indicate that the silica FFs have a considerable potential as radiation sensors in ultra-high dose electrons. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/2855 | |
| dc.subject | Physics (General) | en_US |
| dc.title | Glow Peak Analysis Of Pure And Ge-Doped Silica Flat Fiber At Ultra High Dose Electrons | en_US |
| dc.type | Thesis | en_US |
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