Photon irradiation response of photonic crystal fibres and flat fibres at radiation therapy doses

Hashim, Suhairul; Ibrahim, Suhaimi; Omar, S.S. Che; Alajerami, Y.S.M.; Saripan, M. Iqbal; Noor, Noramaliza Mohd; Ung, Ngie Min; Mahdiraji, Ghafour Amouzad; Bradley, D.A.; Alzimami, K.

doi:10.1016/j.apradiso.2014.04.016

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…Recently, together with our collaborators in radiation physics, we have reported on the performance of several tailor-made optical fibre TLDs 25 26 27 28 29 30 31 , initial observations pointing to the considerable potential of flat optical fibres 31 32 as a sensitive TL material for radiotherapy applications 26 27 29 31 . In addition, we have recently compared the performance of a capillary fibre with that of a flat fibre (FF) fabricated from the same fibre preform, confirming significant TL yield improvement from the FF compared to that of capillary fibre 28 33 .…”

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confidence: 99%

Sensitive Fibre-Based Thermoluminescence Detectors for High Resolution In-Vivo Dosimetry

Ghomeishi

Mahdiraji

Adikan

et al. 2015

Sci Rep

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With interest in the potential of optical fibres as the basis of next-generation thermoluminescence dosimeters (TLDs), the development of suitable forms of material and their fabrication has become a fast-growing endeavour. Present study focuses on three types of Ge-doped optical fibres with different structural arrangements and/or shapes, namely conventional cylindrical fibre, capillary fibre, and flat fibre, all fabricated using the same optical fibre preform. For doses from 0.5 to 8 Gy, obtained at electron and photon energies, standard thermoluminescence (TL) characteristics of the optical fibres have been the subject of detailed investigation. The results show that in collapsing the capillary fibre into a flat shape, the TL yield is increased by a factor of 5.5, the yield being also some 3.2 times greater than that of the conventional cylindrical fibre fabricated from the same perform. This suggests a means of production of suitably sensitive TLD for in-vivo dosimeter applications. Addressing the associated defects generating luminescence from each of the optical fibres, the study encompasses analysis of the TL glow curves, with computerized glow curve deconvolution (CGCD) and 2nd order kinetics.

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mentioning

confidence: 99%

Sensitive Fibre-Based Thermoluminescence Detectors for High Resolution In-Vivo Dosimetry

Ghomeishi

Mahdiraji

Adikan

et al. 2015

Sci Rep

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“…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%

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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“…Whereas the luminescence properties of inorganic rare‐earths compounds have been widely studied, [ 17–21 ] there is practically no information on the TL of lanthanide coordination compounds, although there is available information on TL in organic compounds, as well as in polymers. [ 22–25 ]…”

Section: Introductionmentioning

confidence: 99%

“…Whereas the luminescence properties of inorganic rare-earths compounds have been widely studied, [17][18][19][20][21] there is practically no information on the TL of lanthanide coordination compounds, although there is available information on TL in organic compounds, as well as in polymers. [22][23][24][25] Previously, we obtained interesting coordination compounds of terbium and dysprosium, which are able to store the energy from ultraviolet (UV) and X-ray radiation. [26,27] The energy from UV and X-ray radiation stored by these materials can be stored indefinitely at a low temperature even if the external excitation is removed.…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescent Tb(III) and Dy(III) complexes with redox‐active ligands: experimental and theoretical study

Emelina

Мирочник

2022

Luminescence

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Thermoluminescence and persistent luminescent materials with unique delayed emission have attracted much attention and exhibit great promise in optical information storage. In this manuscript, to reveal the thermoluminescence mechanism, a combined experimental and theoretical study of ternary Ln(NO3)2Acac(Phen)2 complexes, where Ln is Tb(III), Dy(III), Eu(III), Acac is acetylacetonate anion, and Phen is 1,10‐phenanthroline, was carried out. The terbium and dysprosium complexes had thermoluminescence properties, while the europium complex did not. A thermoluminescence mechanism is proposed: the powerful double π‐conjugate phenanthroline system appearance upon photoexcitation, the peculiarities of frontier orbitals, the abnormally small highest occupied molecular orbital–lowest unoccupied molecular orbital gap, and the geometrical changes in the terbium and dysprosium complexes led us to suggest that phenanthroline molecules serve as ‘chemical’ electron traps. Therefore, we succeeded in ‘freezing’ and storing the excited state of complexes I and II indefinitely. The obtained thermoluminescent materials with ‘chemical’ traps of electrons are capable of storing the energy from incident photons and exhibit a great opportunity in optical information storage and anticounterfeiting applications.

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Photon irradiation response of photonic crystal fibres and flat fibres at radiation therapy doses

Cited by 11 publications

References 12 publications

Sensitive Fibre-Based Thermoluminescence Detectors for High Resolution In-Vivo Dosimetry

Sensitive Fibre-Based Thermoluminescence Detectors for High Resolution In-Vivo Dosimetry

Recent Advances in Silica Glass Optical Fiber for Dosimetry Applications

Thermoluminescent Tb(III) and Dy(III) complexes with redox‐active ligands: experimental and theoretical study

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