Assessment of Ge-doped optical fibres subjected to x-ray irradiation

Ibrahim, Suhaimi; Omar, S.S. Che; Hashim, Suhairul; Mahdiraji, Ghafour Amouzad; Bradley, D.A.; Kadir, A B; Isa, Naurah Mat

doi:10.1088/1742-6596/546/1/012017

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…It can be concluded that the sensitivity of the optical fibres are dependent on the cross-sectional dimensions of the optical fibres and the concentration of Ge-dopant in the fibres. The difference in sensitivity at the higher dose is due to low optical signal at these doses, giving a high signal-to-noise ratio [50].…”

Section: Plos Onementioning

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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Section: Plos Onementioning

confidence: 99%

Tailored Ge-doped fibres for passive electron radiotherapy dosimetry

et al. 2020

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“…Thermoluminescence occurs as the emission of light from thermoluminescence material (e.g., semiconductor and doped fiber) [2,4]. The thermoluminescence response of doped silica glass fibers has been studied for numerous radiation sources including X-ray [23,24], gamma-ray [25][26][27], proton [28,29], electron [25,30], alpha particles [31], fast neutrons [32], and synchrotron radiation [33]. In addition, the performance of irradiated fibers has illustrated a considerable potential for dosimetry applications such as radiotherapy [31], industrial, and irradiation rooms [34].…”

Section: Introductionmentioning

confidence: 99%

A Fiber-Optical Dosimetry Sensor for Gamma-Ray Irradiation Measurement in Biological Applications

Elsharkawi,

Alazab,

Sayed

et al. 2023

Biosensors

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In this paper, we propose a novel fiber-optical dosimetry sensor for radiation measurement in biological applications. A two-dimensional (2D) fiber-optical dosimeter (FOD) for radiation measurement is considered. The sensors are arranged as a 2D array in a tailored holder. This FOD targets accurate industrial and medical applications which seek more tolerant radiation dosimeters. In this paper, the FOD sensors are subjected to gamma-ray radiation facilities from the 137Cs gamma-ray irradiator type for low doses and 60Co gamma-ray irradiator for high doses. For better evaluation of radiation effects on the FOD sample, the measurements are performed using eight sensors (hollow cylinder shape) with two samples in each dose. The sensors were measured before and after each irradiation. To the author’s knowledge, the measurements of FOD transplanted inside animals are presented for the first time in this paper. A 2D simulation program has been implemented for numerical simulation based on the attenuation factors from the absorbed dose inside the in vivo models. A comparison between the FOD and the standard thermo-luminescence detector is presented based on the test of in vivo animal models. The results indicate that the proposed FOD sensor is more stable and has higher sensitivity.

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“…The decreasing trend with dose concerns the reducing availability of unfilled traps with increase in dose [18]. Nevertheless, at greater dose, a useable signal-to-noise ratio is retained [19].…”

Section: Sensitivity ¼ Tl Intensity Incident Dose X Mass Of Tl Materimentioning

confidence: 99%

Low-cost commercial borosilicate glass slides for passive radiation dosimetry

et al. 2020

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For x- and gamma- irradiations delivering entrance doses from 2- up to 1000 Gy to commercial 1.0 mm thick borosilicate glass microscope slides, study has been made of their thermoluminescence yield. With an effective atomic number of 10.6 (approximating bone equivalence), photon energy dependency is apparent in the low x-ray energy range, with interplay between the photoelectric effect and attenuation. As an example, over the examined dose range, at 120 kVp the photon sensitivity has been found to be some 5× that of 60Co gamma irradiations, also with repeatability to within ~1%. The glow-curves, taking the form of a single prominent broad peak, have been deconvolved yielding at best fit a total of five peaks, the associated activation energies and frequency factors also being obtained. The results indicate borosilicate glass slides to offer promising performance as a low-cost passive radiation dosimeter, with utility for both radiotherapy and industrial applications.

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Assessment of Ge-doped optical fibres subjected to x-ray irradiation

Cited by 7 publications

References 11 publications

Tailored Ge-doped fibres for passive electron radiotherapy dosimetry

Tailored Ge-doped fibres for passive electron radiotherapy dosimetry

A Fiber-Optical Dosimetry Sensor for Gamma-Ray Irradiation Measurement in Biological Applications

Low-cost commercial borosilicate glass slides for passive radiation dosimetry

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