Affiliation:
1. GenesisCare Adelaide
2. Defence Science & Technology Group
3. Competence Center for Specialty Optical Fibers and Fiber Research and Technology
Abstract
Large core soft glass fibers have been demonstrated to be promising candidates as intrinsic fiber sensors for radiation detection and dosimetry applications. Doping with rare earth ions enhanced their radiation sensitivity. SiO2-Al2O3-La2O3 (SAL) glasses offer easy fabrication of large core fibers with high rare earth concentration and higher mechanical strength than soft glasses. This paper evaluates the suitability of the SAL glass type for radiation dosimetry based on optically stimulated luminescence (OSL) via a comprehensive investigation of the spectroscopic and dosimetric properties of undoped and differently rare earth doped bulk SAL glass samples. Due to the low intensity of the rare earth luminescence peaks in the 250–400 nm OSL detection range, the OSL response for all the SAL glasses is not caused by the rare earth ions but by radiation-induced defects that act as intrinsic centers for the recombination of electrons and holes produced by the ionizing radiation, trapped in fabrication induced defect centers, and then released via stimulation with 470 nm light. The rare earth ions interfere with these processes involving intrinsic centers. This dosimetric behavior of highly rare earth doped SAL glasses suggests that enhancement of OSL response requires lower rare earth concentrations and/or longer wavelength OSL detection range.
Funder
Australian Research Council
Defence Science and Technology Group
University of Adelaide
Deutscher Akademischer Austauschdienst
European Regional Development Fund
European Social Fund
Thüringer Ministerium für Wirtschaft, Arbeit und Technologie
Australian National Fabrication Facility
Subject
Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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