Charge sharing in CdTe pixilated detectors

Abstract

Charge sharing was studied in Schottky CdTe detectors with segmented anode. The 1 mm-thick detector is integrated in a complete micro-camera called Caliste 64. The associated electronics gives for each event the time, the position and the energy. In case of split events, at least two neighbor pixels trigger in temporal coincidence. A model taking into account X-ray fluorescence and charge sharing correctly describes the experimental split event rates. The reconstruction of incident energy gives very good results, with a spectral resolution of 1.2 keV FWHM at 60 keV from the double events only. Charge loss in the pixel gap is estimated to be 0.5%.