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Photon counting X-ray imaging with CdTe pixel detectors based on XPAD2 circuit

Abstract : A semiconductor hybrid pixel detector for photon counting X-ray imaging has been developed and tested under radiation. The sensor is based on recent uniform CdTe single crystal associated with XPAD 2 counting chip via innovative processes of interconnection. The building detector is 1 mm thick, with an area of 1 cm2 and consists of 600 square pixels cells 330 μm side. The readout chip working in electron collection mode is capable of setting homogeneous threshold with only a dispersion of 730 e−. Maximum noise level has been evaluated around 15 keV. First experiments under X-rays demonstrate a very good efficiency of detection. Moreover, imaging system allows excellent linearity over a large-scale achieving count rate of 3×106 photons/s/mm2. Spectrometric measurements point up the system potential in multi-energies applications by locating and resolving X-rays lines of 241Am and 57Co sources.
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http://hal.in2p3.fr/in2p3-00087835
Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Thursday, July 27, 2006 - 10:09:01 AM
Last modification on : Tuesday, October 19, 2021 - 10:50:33 PM

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R. Franchi, F. Glasser, A. Gasse, J.-C. Clemens. Photon counting X-ray imaging with CdTe pixel detectors based on XPAD2 circuit. 7th International Workshop on Radiation Imaging Detectors - IWORID 2005, Jul 2005, Grenoble, France. pp.249-253, ⟨10.1016/j.nima.2006.01.105⟩. ⟨in2p3-00087835⟩

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