Radioluminescence of Ge-doped silica optical fibre and Al2O3:C dosimeters


Abdul Rashid, Hairul Azhar and Mizanur Rahman, A. K. M. and Begum, Mahfuza Sharmila and Begum, Mahbuba and Zubair, H. T. and Yusoff, Zulfadzli and Bradley, D. A. (2018) Radioluminescence of Ge-doped silica optical fibre and Al2O3:C dosimeters. Sensors and Actuators A: Physical, 270. pp. 72-78. ISSN 0924-4247

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Using an electron accelerator producing a 6 MV X-ray photon beam several experimentally observed excitation phenomena that are associated with radioluminescence (RL) have been investigated, the signal originating from a Ge-doped silica optical fibre and commercial nanoDot Al2O3:C dosimeters. Using PMMA optical communication fibres the RL signals have been guided from the beam-delivery room out to the readout instrumentation that has been located beyond the concrete maze providing effective radiation shield. Ge-doped silica fibre memory effects and afterglow (phosphorescence) were compared with that of the commercial Al2O3:C dosimeter. Immediately following RL, observation was made of the decay curves of the afterglow signal of Al2O3:C. Conversely, there was little practically observable afterglow for the Ge-doped fibre used for the majority of present investigations (the dopant concentration of this being 3.6 wt %). Among three different concentration of Ge-doped fibres that were subsequently investigated in a follow-up study, the intensity of afterglow was found to be greatest for the more highly doped concentration (7.0 wt % Ge), with progressive reduction of the effect for the Ge 4.7 wt % and Ge 3.6 wt % fibres. These observations can be compared against the much more marked RL memory effect observed using the Al2O3:C chips. Current results pointto the Ge-doped silica optical fibre being a highly promising candidate for real-time RL dosimetry and sensing.

Item Type: Article
Uncontrolled Keywords: Fiber optics, Radioluminescence, Ge-doped optical fibre, NanoDots Al2O3C, Afterglow
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 22 Oct 2020 17:20
Last Modified: 22 Oct 2020 17:20


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