Abstract
High-energy gamma-ray imaging is an important technique with applications in homeland security and medical imaging. Recent advancements in the cadmium zinc telluride (CdZnTe) OrionUM detector systems have enabled measurement of gamma-ray sources with energies up to 9 MeV. However, Compton imaging of photons above 3 MeV faces several challenges that degrade both spectroscopic and imaging performances in pixelated CdZnTe systems. These factors include the increase in pair-production events, incorrect event sequencing, and charge sharing from large electron clouds. They all result in shift-variant image artifacts that degrade the signal-to-noise ratio as well as create artifacts that might be mistaken for a hot spot. The degradation from artifacts is analyzed and discussed, and possible mitigation techniques are presented to allow for recovery of the Compton image signal. Simulation is compared with experimental measurements of 4.4-MeV gamma rays from a 238PuBe source to investigate the artifacts.
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