Design and characterization of a near-field gamma imager for in situ measurements of fuel rod deformations
Résumé
A prototype of gamma imager system has been developed for detecting fuel rod deformations, based on the WidePIX hybrid pixel detector, associated with a collimator. The WidePIX detector used in the frame of these developements is made of 2×5 Timepix devices hybridized with a 1 mm-thick cadmium telluride semiconductor. A specific collimator was designed, offering the best compromise between mechanical feasibility, cost, signal-to-noise ratio and angular resolution, and making it possible to visualise the the fuel rod deformations. In this work, we present the design of the collimator carried out by numerical Monte-Carlo simulations, and experimental results obtained with this prototype on a Cs-137 and Co-60 metrological irradiator.
Mots clés
instrumentation
nuclear instrumentation
Gamma imaging
Electronic architecture
detector
gamma-rays
ionizing radiation
radioactivity
gamma spectrometry
spectrometry
collimator
signal-to-noise ratio
angular resolution
Monte Carlo
simulation
irradioator
metrology
137Cs
60Co
Near-field gamma imaging
Hybrid pixel detectors
Highly irradiating measurements
Fuel rod deformations
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