Preliminary results on the photo-transferred thermoluminescence from Ge-doped SiO 2  optical fiber

Zulkepely, Nurul Najua; Amin, Yusoff Mohd; Nor, Roslan Md; Bradley, D.A.; Maah, Mohd Jamil; Nawi, Siti Nurasiah Mat; Wahib, Norfadira

doi:10.1016/j.radphyschem.2015.08.005

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…The graphs of dose response for 6 and 8 mol % various dimension cylindrical and flat fibre cross-sections and the TLD-100 chips are shown in Figs 4 and 5. The results show linear for all cases entire the doses study and the linear TL response supporting findings from previous number of workers [16,27,30,[40][41]. The increase in TL yield with dose remains linear over a wide range of values specifically from the 1Gy up to 4 Gy dose range investigated.…”

Section: Dose Responsesupporting

confidence: 88%

Tailored Ge-doped fibres for passive electron radiotherapy dosimetry

et al. 2020

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Study has been made of the thermoluminescence yield of various novel tailor-made silica fibres, 6 and 8 mol % Ge-doped, with four differing outer dimensions, comprised of flat and cylindrical shapes, subjected to electron irradiation. Main thermoluminescence dosimetric characteristics have been investigated, including the glow curve, dose response, energy dependence, minimum detectable dose, effective atomic number, linearity of index and sensitivity of the fibres. The studies have also established the uncertainties involved as well as the stability of response in terms of fading effect, reproducibility and annealing. In addition, dose-rate dependence was accounted for as this has the potential to be a significant factor in radiotherapy applications. The 6 and 8 mol % fibres have been found to provide highly linear dose response within the range 1 to 4 Gy, the smallest size flat fibre, 6 mol% Ge-doped, showing the greatest response by a factor of 1.1 with respect to the highly popular LiF phosphor-based medium TLD100. All of the fibres also showed excellent reproducibility with a standard deviation of < 2% and < 4% for 6 and 8 mol % Ge-doped fibres respectively. For fading evaluation, the smallest 6 mol% Ge-doped dimension flat fibre, i.e., 85 × 270 μm displayed the lowest signal loss within 120 days post-irradiation, at around 26.9% also showing a response superior to that of all of the other fibres. Moreover, all the fibres and TLD-100 chips showed independence with respect to electron irradiation energy and dose-rate. Compared with the 8 mol% Ge-doped optical fibres, the 6 mol% Ge-doped flat optical fibres have been demonstrated to possess more desirable performance features for passive dosimetry, serving as a suitable alternative to TLD-100 for medical irradiation treatment applications.

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Section: Dose Responsesupporting

confidence: 88%

Tailored Ge-doped fibres for passive electron radiotherapy dosimetry

et al. 2020

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Developments in production of silica-based thermoluminescence dosimeters

Bradley

Shafiqah

Rozaila

et al. 2017

Radiation Physics and Chemistry

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This work addresses purpose-made thermoluminescence dosimeters (TLD) based on doped silica fibres and sol-gel nanoparticles, produced via Modified Chemical Vapour Deposition (MCVD) and wet chemistry techniques respectively. These seek to improve upon the versatility offered by conventional phosphor-based TLD forms such as that of doped LiF. Fabrication and irradiation-dependent factors are seen to produce defects of differing origin, influencing the luminescence of the media. In coming to a close, we illustrate the utility of Ge-doped silica media for ionizing radiation dosimetry, first showing results from gammairradiated Ag-decorated nanoparticles, in the particular instance pointing to an extended dynamic range of dose. For the fibres, at radiotherapy dose levels, we show high spatial resolution (0.1 mm) depth-dose results for proton irradiations. For novel microstructured fibres (photonic crystal fibres, PCFs) we show first results from a study of undisturbed and technologically modified naturally occurring radioactivity environments, measuring doses of some 10 s of μGy over a period of several months.

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