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Title: Near infrared radio-luminescence of O{sub 2} loaded radiation hardened silica optical fibers: A candidate dosimeter for harsh environments

We report on an experimental investigation of the infrared Radio-Luminescence (iRL) emission of interstitial O{sub 2} molecules loaded in radiation hardened pure-silica-core and fluorine-doped silica-based optical fibers (OFs). The O{sub 2} loading treatment successfully dissolved high concentrations of oxygen molecules into the silica matrix. A sharp luminescence at 1272 nm was detected when 2.5 cm of the treated OFs were irradiated with 10 keV X-rays. This emission originates from the radiative decay of the first excited singlet state of the embedded O{sub 2} molecules. The dose, dose-rate, and temperature dependencies of the infrared emission are studied through in situ optical measurements. The results show that the iRL is quite stable in doses of up to 1 MGy(SiO{sub 2}) and is linearly dependent on the dose-rate up to the maximum investigated dose-rate of ∼200 kGy(SiO{sub 2})/h. The temperature dependency of the iRL shows a decrease in efficiency above 200 °C, which is attributed to the non-radiative decay of the excited O{sub 2} molecules. The results obtained and the long-term stability of the O{sub 2}-loading treatment (no out-gassing effect) strongly suggest the applicability of these components to real-time remote dosimetry in environments characterized by high radiation doses and dose-rates.
Authors:
 [1] ;  [2] ; ; ;  [1] ; ;  [3] ; ;  [4]
  1. Laboratoire Hubert Curien, UMR-CNRS 5516, F-42000 Saint-Etienne (France)
  2. (Italy)
  3. Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, I-90123 Palermo (Italy)
  4. CEA, DAM, DIF, F-91297 Arpajon (France)
Publication Date:
OSTI Identifier:
22391920
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; DOSE RATES; DOSEMETERS; DOSIMETRY; FLUORINE; LUMINESCENCE; OPTICAL FIBERS; OXYGEN; RADIATION DOSES; RADIATIVE DECAY; SILICA; SILICON OXIDES; X RADIATION