Radioluminescence of cylindrical and flat Ge-doped silica optical fibers for real-time dosimetry applications


Oresegun, Adebiyi and Tarif, Zubair H. and Ghassan, Louay and Zin, Hafiz and Abdul Rashid, Hairul Azhar and Bradley, D. A. (2021) Radioluminescence of cylindrical and flat Ge-doped silica optical fibers for real-time dosimetry applications. Applied Radiation and Isotopes, 176. p. 109812. ISSN 0969-8043

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Investigation has been made of the radioluminescence dose response of Ge-doped silica flat and cylindrical fibers subjected to 6 and 10 MV photon beams. The fibers have been custom fabricated, obtaining Ge dopant concentrations of 6 and 10 mol%, subsequently cut into 20 mm lengths. Each sample has been exposed under a set of similar conditions, with use made of a fixed field size and source to surface distance (SSD). Investigation of dosimetric performance has involved radioluminescence linearity, dose-rate dependence, energy dependence, and reproducibility. Mass for mass, the 6 mol% Ge-doped samples provided the greater radioluminescence yield, with both flat and cylindrical fibers responding linearly to the absorbed dose. Further found has been that the cylindrical fibers provided a yield some 38% greater than that of the flat fibers. At 6 MV, the cylindrical fibers were also found to exhibit repeatability variation of <1%, superior to that of the flat fibers, offering strong potential for use in real-time dosimetry applications.

Item Type: Article
Uncontrolled Keywords: Radioluminescence, Real-time dosimetry, Optical fiber scintillator, Germanium, Radiotherapy
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Nurul Iqtiani Ahmad
Date Deposited: 05 Aug 2021 07:57
Last Modified: 05 Aug 2021 07:57


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