[Legacy Report] Investigations of GaAs:Cr as sensor material for photon counting detectors

#GaAs:Cr #sensors #photon #counting #detectors

High resistivity, chromium compensated gallium arsenide (HR-GaAs:Cr) has gained increasing attention during the last years as high (or intermedium) Z material to be used as Xand gamma ray detector sensor material for energies up to 60 keV. In this presentation I will, after a short review of the history of GaAs as detector material, present the work conducted during the last years at KIT, Karlsruhe, related to the characterization and application of HRGaAs:Cr. The results from investigations of the material properties, showing its detector grade quality, as well as first applications in combination with different types of photon counting detectors from the Medipix family are shown, using 500 µm and 1 mm thick sensors. Where possible, the performance of HR-GaAs:Cr is compared to another, highly regarded high-Z material, namely CdTe which is also frequently used as sensor material for photon counting detectors.

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• IEAP meeting room, Praha 2 ‐ Albertov, Horská 3a/22, Berlin
• Czech Republic

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