Thermoluminescence response of flat optical fiber subjected to 9MeV electron irradiations

Hashim, Suhairul; Omar, S.S. Che; Ibrahim, Suhaimi; Hassan, Wan Muhamad Saridan Wan; Ung, Ngie Min; Mahdiraji, Ghafour Amouzad; Bradley, D.A.; Alzimami, K.

doi:10.1016/j.radphyschem.2014.06.028

Cited by 23 publications

(14 citation statements)

References 17 publications

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“…The error bars were obtained from the standard deviation of the readout for the five fibers used at each dose. The associated dose response curves (according with the integrated TL yield at each dose) for the various flat fiber cross-sections and for the TLD100 chips are shown in Figure 3 , the linear TL response supporting findings from previous study [ 1 , 8 , 10 , 11 , 14 ]. In the present study, the increase in TL yield with dose remains linear over a wide range of values, from 2 Gy up to 10 Gy, the flat fibers of physical dimensions 200 × 750 µm, 165 × 620 µm, 100 × 350 µm, 85 × 270 µm showing TL yields of the order of 0.22, 0.40, 0.50 and 1.10 respectively with respect to TLD100 chips.…”

Section: Resultssupporting

confidence: 85%

The Thermoluminescence Response of Ge-Doped Flat Fibers to Gamma Radiation

Nawi

Wahib

Zulkepely

et al. 2015

Sensors

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Study has been undertaken of the thermoluminescence (TL) yield of various tailor-made flat cross-section 6 mol% Ge-doped silica fibers, differing only in respect of external dimensions. Key TL dosimetric characteristics have been investigated, including glow curves, dose response, sensitivity, fading and reproducibility. Using a 60Co source, the samples were irradiated to doses within the range 1 to 10 Gy. Prior to irradiation, the flat fibers were sectioned into 6 mm lengths, weighed, and annealed at 400 °C for 1 h. TL readout was by means of a Harshaw Model 3500 TLD reader, with TLD-100 chips (LiF:Mg, Ti) used as a reference dosimeter to allow the relative response of the fibers to be evaluated. The fibers have been found to provide highly linear dose response and excellent reproducibility over the range of doses investigated, demonstrating high potential as TL-mode detectors in radiation medicine applications. Mass for mass, the results show the greatest TL yield to be provided by fibers of the smallest cross-section, analysis indicating this to be due to minimal light loss in transport of the TL through the bulk of the silica medium.

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Section: Resultssupporting

confidence: 85%

The Thermoluminescence Response of Ge-Doped Flat Fibers to Gamma Radiation

Nawi

Wahib

Zulkepely

et al. 2015

Sensors

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“…Espinosa et al (2006) shows a quite similar finding of a glow curve between 30°C and 400°C after exposure to 60 Co gamma radiation, showing one very well defined glow peak with a maximum at 230°C. This finding is also consistent with Alawiah et al (2015), who observed a glow peak of pure silica FF at $ 210°C, after exposure of 6 MeV electrons, and 230-255°C after 9 MeV electron irradiation, by Hashim et al (2015). A significant decrease of the maximum temperature of the glow curve (256-209°C) is observed as the UHD increases from 1 kGy to 1 MGy.…”

Section: Resultssupporting

confidence: 90%

Thermoluminescence glow curves and deconvoluted glow peaks of Ge doped flat fibers at ultra-high doses of electron radiation

Alawiah

Bauk

Marashdeh

et al. 2015

Radiation Physics and Chemistry

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“…Other than that, this condition may be attributed to non-uniform spatial ionization density following electron irradiation. This phenomenon has been successfully introduced as the Unified Interaction Model (UNM) [39,47]. Therefore, to overcome this problem the linearity Index was determined using formula:…”

Section: Year Researcher Dosimetric Materials Dosimetric Characterisatmentioning

confidence: 99%

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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Thermoluminescence response of flat optical fiber subjected to 9MeV electron irradiations

Cited by 23 publications

References 17 publications

The Thermoluminescence Response of Ge-Doped Flat Fibers to Gamma Radiation

The Thermoluminescence Response of Ge-Doped Flat Fibers to Gamma Radiation

Thermoluminescence glow curves and deconvoluted glow peaks of Ge doped flat fibers at ultra-high doses of electron radiation

Tailored Ge-doped fibres for passive electron radiotherapy dosimetry

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