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Owen Mc Laughlin

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Proceedings Article | 17 May 2022 Presentation + Paper

Evaluating the temperature dependence of an inorganic scintillator detector using the HYPERSCINT research platform

Owen Mc Laughlin, Michael Martyn, Christoph Kleefeld, Mark Foley

Proceedings Volume 12139, 121390M (2022) https://doi.org/10.1117/12.2620463

KEYWORDS: Sensors, Scintillators, Optical fibers, Gadolinium, Temperature metrology, Scintillation, In vivo imaging, Visible radiation, Photon counting, Luminescence

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Optical fibre scintillation detectors have proven to be a viable alternative in clinical radiation dosimetry. By obtaining active readouts, scintillators can be used to give real time measurements for various clinical and pre-clinical applications from radiology to radiation therapy. Gd₂O₂S:Pr is of interest as a scintillator due to it offering a much higher light output than other scintillators, organic scintillators in particular. Temperature dependence is exhibited by a number of organic scintillators, such as BCF-60; this however needs to be established for the inorganic scintillator Gd₂O₂S:Pr. This study therefore aims to characterize the temperature dependence of Gd₂O₂S:Pr, using the HYPERSCINT Research Platform 200. The detector was immersed in water and the temperature varied from 22.7°C to 49.0°C using a hotplate and temperature controller. Five spectra were recorded and averaged at each of the seven temperatures, in approximately 5°C increments. A decrease in total photon count with temperature was observed of 0.22%/°C between 346 and 631 nm with a decrease of 0.38 in the full width at half maximum at the photopeak of 513 nm. A method of correcting for temperature is necessary in the use of Gd₂O₂S:Pr as a detection material in environments where the temperature differs significantly from the calibration temperature.

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