Radioluminescence of cylindrical and flat Ge-doped silica optical fibers for real-time dosimetry applications. (October 2021)

• Record Type: Journal Article
• Authors: Oresegun, Adebiyi; Tarif, Zubair H.; Ghassan, Louay; Zin, Hafiz; Abdul-Rashid, Hairul Azhar; Bradley, D.A.
• Is Part Of: Applied radiation and isotopes. Volume 176(2021)
• Publication Date: 2021-10
• Subjects: Radioluminescence -- Real-time dosimetry -- Optical fiber scintillator -- Germanium -- Radiotherapy; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2021.109812
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: 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. Highlights: Doped silica fibers have been custom fabricated, obtaining Ge dopant concentrations of 6 and 10 mol%. Radioluminescence dose response of Ge-doped silica flat and cylindrical fibers obtained using 6 and 10 MV photon beams. Variation in response highlighted for dose range 1 cGy–400 cGy, delivered at 600 cGy min −1 . Cylindrical fibers provided a yield some 38% greater than that of the flat fibers.