Thermoluminescence characteristics of Ge-doped optical fibers with different dimensions for radiation dosimetry

Begum, Mahbuba; Rahman, A.K.M. Mizanur; Abdul-Rashid, H. A.; Yusoff, Z.; Mat-Sharif, K. A.; Amin, Yusoff Mohd; Bradley, D.A.

doi:10.1016/j.apradiso.2014.10.025

Cited by 20 publications

(5 citation statements)

References 14 publications

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“…With tissue equivalency playing a critical role in radiation therapy dosimetry, it is notable for instance that the photoelectric interaction is approximately proportional to the 3rd power of the material atomic number (Z 3 ). Tabulated in Table 3, [66] found that the Z eff values (13.25-13.43) of the five optical fibers fall within the human-bones range of from 11.6 to 13.8, in keeping with [67], who also found that the Ge-doped SiO 2 optical fibers provided a similar Z eff value, making the doped silica useful as human-bone equivalent for dosimetric purposes.…”

Section: Effective Atomic Numbersupporting

confidence: 52%

“…[65] record it to be conventional to seek a Z eff value that is ideally human soft-tissue equivalent (i.e., typically taken to be 7.42), with [66] going on to record that a Z eff value that is human tissue equivalent is dependent on the incident photon energy and its direct association with the degree (the probability) to which primary photon interactions take place within the detector medium. With tissue equivalency playing a critical role in radiation therapy dosimetry, it is notable for instance that the photoelectric interaction is approximately proportional to the 3rd power of the material atomic number (Z 3 ).…”

Section: Effective Atomic Numbermentioning

confidence: 99%

“…The effects of different factors of silica fibers as a TLD were also investigated to improve TL yields in radiotherapy dosimetry. It includes the influences of several dopants [73], [74]; dopant concentration [75], [76]; core diameters [55], [66]; flat fibers [30], [77]; photonic crystal fibers/ micro structured fiber [51], [78] etc. that can deliver significant potential for megavoltage high energy beams in radiotherapy.…”

Section: External Beam Radiotherapymentioning

confidence: 99%

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Recent Advances in Silica Glass Optical Fiber for Dosimetry Applications

et al. 2020

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In this paper, we review the highly promising silica glass, fabricated as doped and undoped optical fiber for intended use in radiation dosimetry. The dosimetry techniques reviewed here, underpinned by intrinsic and extrinsic defects in silica glass, focus on Thermoluminescence (TL), Optically Stimulated Luminescence (OSL) and Radioluminescence (RL), with occasional references to the much more established Radiation Induced Attenuation (RIA). The other focus in this review is on the various materials that have been reported earlier as dopants and modifiers used in silica glass optical fiber radiation dosimeters. This article also elaborates on recently reported optical fiber structures, namely, cylindrical fibers, photonic crystal fibers and flat fibers, as well as dimensions and shapes used for optimization of dosimeter performance. The various types of optical fiber radiation dosimeters are subsequently reviewed for various applications ranging from medical dosimetry such as in external beam radiotherapy, brachytherapy and diagnostic imaging, as well as in industrial processing and space dosimetry covering a dynamic dose range from μGy to kGy. Investigated dosimetric characteristics include reproducibility, fading, dose response, reciprocity between luminescence yield to dose-rate and energy dependence. The review is completed by a brief discussion on limitations and future developments in optical fiber radiation dosimetry.

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Section: Effective Atomic Numbersupporting

confidence: 52%

Section: Effective Atomic Numbermentioning

confidence: 99%

Section: External Beam Radiotherapymentioning

confidence: 99%

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Recent Advances in Silica Glass Optical Fiber for Dosimetry Applications

et al. 2020

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“…To improve the radiation-capturing capability, detection length/accuracy, and robustness of devices, all-fiber RIL radiation fiber sensors were developed as intrinsic sensing (Figure 4d). Based on the development of the fiber thermal drawing process and material engineering, scintillating materials, such as rare earth element doped silica, Ce doped YAlO3, Ce doped Lu1.8Y2SiO3, etc., are inserted into the fiber cladding tube and drawn into scintillating fibers directly (Table 1) [62][63][64][65][66][67][68][69][70][71][72]. For the intrinsic RIL fiber sensor, the fiber not only transmits the generated photons, but also serves as the light emitting element that directly reacts with radiations.…”

Section: Typical Fiber Radiation Dosimeter Based On Rilmentioning

confidence: 99%

Recent Advances in Optical Fiber Enabled Radiation Sensors

Zhang

Xiang

Wang

et al. 2022

Sensors

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Optical fibers are being widely utilized as radiation sensors and dosimeters. Benefiting from the rapidly growing optical fiber manufacturing and material engineering, advanced optical fibers have evolved significantly by using functional structures and materials, promoting their detection accuracy and usage scenarios as radiation sensors. This paper summarizes the current development of optical fiber-based radiation sensors. The sensing principles of both extrinsic and intrinsic optical fiber radiation sensors, including radiation-induced attenuation (RIA), radiation-induced luminescence (RIL), and fiber grating wavelength shifting (RI-GWS), were analyzed. The relevant advanced fiber materials and structures, including silica glass, doped silica glasses, polymers, fluorescent and scintillator materials, were also categorized and summarized based on their characteristics. The fabrication methods of intrinsic all-fiber radiation sensors were introduced, as well. Moreover, the applicable scenarios from medical dosimetry to industrial environmental monitoring were discussed. In the end, both challenges and perspectives of fiber-based radiation sensors and fiber-shaped radiation dosimeters were presented.

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“…More recently, novel glass-based (SiO 2 ) TLDs in fibre form have been introduced, overcoming the hygroscopic issue, and also more recently have been shown to have sufficient sensitivity to make measurements possible down to fractions of a mGy (Siti Rozaila et al 2016). As such, there is perceived potential for the silica-based media to augment or perhaps replace the existing well-established TLDs for the measurement of environmental levels of radiation, examples of which include LiF, CaF 2 , CaSO 4 and Li 2 B 4 O 7 (Begum et al 2015, Hashim et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Environmental monitoring through use of silica-based TLD

et al. 2017

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The sensitivity of a novel silica-based fibre-form thermoluminescence dosimeter was tested off-site of a rare-earths processing plant, investigating the potential for obtaining baseline measurements of naturally occurring radioactive materials. The dosimeter, a Ge-doped collapsed photonic crystal fibre (PCFc) co-doped with B, was calibrated against commercially available thermoluminescent dosimetry (TLD) (TLD-200 and TLD-100) using a bremsstrahlung (tube-based) x-ray source. Eight sampling sites within 1 to 20 km of the perimeter of the rare-earth facility were identified, the TLDs (silica- as well as TLD-200 and TLD-100) in each case being buried within the soil at fixed depth, allowing measurements to be obtained, in this case for protracted periods of exposure of between two to eight months. The values of the dose were then compared against values projected on the basis of radioactivity measurements of the associated soils, obtained via high-purity germanium gamma-ray spectrometry. Accord was found in relative terms between the TL evaluations at each site and the associated spectroscopic results. Thus said, in absolute terms, the TL evaluated doses were typically less than those derived from gamma-ray spectroscopy, by ∼50% in the case of PCFc-Ge. Gamma spectrometry analysis typically provided an upper limit to the projected dose, and the Marinelli beaker contents were formed from sieving to provide a homogenous well-packed medium. However, with the radioactivity per unit mass typically greater for smaller particles, with preferential adsorption on the surface and the surface area per unit volume increasing with decrease in radius, this made for an elevated dose estimate. Prevailing concentrations of key naturally occurring radionuclides in soil, Ra,Th and K, were also determined, together with radiological dose evaluation. To date, the area under investigation, although including a rare-earth processing facility, gives no cause for concern from radiological impact. The current study reveals the suitability of the optical fibre based micro-dosimeter for all-weather monitoring of low-level environmental radioactivity.

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Thermoluminescence characteristics of Ge-doped optical fibers with different dimensions for radiation dosimetry

Cited by 20 publications

References 14 publications

Recent Advances in Silica Glass Optical Fiber for Dosimetry Applications

Recent Advances in Silica Glass Optical Fiber for Dosimetry Applications

Recent Advances in Optical Fiber Enabled Radiation Sensors

Environmental monitoring through use of silica-based TLD

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