Properties of Gd-Doped Sol-Gel Silica Glass Radioluminescence under Electron Beams
Author:
Söderström DanielORCID, Timonen Oskari, Kettunen Heikki, Kronholm Risto, El Hamzaoui Hicham, Capoen BrunoORCID, Ouerdane YoucefORCID, Morana AdrianaORCID, Javanainen ArtoORCID, Bouwmans Géraud, Bouazaoui Mohamed, Girard Sylvain
Abstract
The radiation-induced emission (RIE) of Gd3+-doped sol–gel silica glass has been shown to have suitable properties for use in the dosimetry of beams of ionizing radiation in applications such as radiotherapy. Linear electron accelerators are commonly used as clinical radiotherapy beams, and in this paper, the RIE properties were investigated under electron irradiation. A monochromator setup was used to investigate the light properties in selected narrow wavelength regions, and a spectrometer setup was used to measure the optical emission spectra in various test configurations. The RIE output as a function of depth in acrylic was measured and compared with a reference dosimeter system for various electron energies, since the dose–depth measuring abilities of dosimeters in radiotherapy is of key interest. The intensity of the main radiation-induced luminescence (RIL) of the Gd3+-ions at 314 nm was found to well represent the dose as a function of depth, and was possible to separate from the Cherenkov light that was also induced in the measurement setup. After an initial suppression of the luminescence following the electron bunch, which is ascribed to a transient radiation-induced attenuation from self-trapped excitons (STEX), the 314 nm component was found to have a decay time of approximately 1.3 ms. An additional luminescence was also observed in the region 400 nm to 600 nm originating from the decay of the STEX centers, likely exhibiting an increasing luminescence with a dose history in the tested sample.
Funder
European Union’s Horizon 2020 Research and Innovation Programme European Space Agency ANR: LABEX CEMPI Equipex Flux Ministry of Higher Education and Research auts-de-France Regional Council and the European Regional Development Fund
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
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