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Phosphor thermometry for nuclear decommissioning and waste storage

Sposito, A; Heaps, E; Sutton, G; Machin, G; Bernard, R; Clarke, S (2021) Phosphor thermometry for nuclear decommissioning and waste storage. Nuclear Engineering and Design, 375. 111091 ISSN 00295493

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Reliable surface thermometry of stored nuclear waste containers is essential for both health monitoring and corrosion modelling. In this paper we investigate the feasibility of using phosphor thermometry for long-term temperature monitoring of nuclear waste containers and storage racks. Two strands of research were conducted. Firstly, two thermographic phosphors (ruby and manganese-doped magnesium fluorogermanate [MFG]), mixed with six different binders were coated onto stainless steel (316L) substrates and exposed for one month to gamma radiation (γ-ray) and sodium hydroxide (NaOH) solution. Secondly, a hybrid fibre-optic phosphor thermometer, capable of measuring these samples, was constructed and tested. The instrument can measure temperatures using both the fluorescence decay time and intensity ratio techniques. Following γ-ray and NaOH exposure, no significant degradation in phosphor appearance or performance was observed. The MFG/silicone binder combination gave the best results. The hybrid phosphor thermometer demonstrated for MFG/silicone binder that:
▪ the intensity ratio technique gave the lowest measurement standard deviation (σ(T) < 0.1 °C) but suffered minor drift with thermal cycling.
▪ the decay time technique (650 nm emission) did not show any drift and was capable of a measurement standard deviation of σ(T) ≤ 0.3 °C.

Item Type: Article
Keywords: temperature, phosphor thermometry, nuclear applications, harsh environment
Subjects: Engineering Measurements > Thermal
Divisions: Thermal & Radiometric Metrology
Identification number/DOI: 10.1016/j.nucengdes.2021.111091
Last Modified: 23 Jul 2021 13:54
URI: http://eprintspublications.npl.co.uk/id/eprint/9251

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