  The main methods grown Cadmium Zinc Telluride (CZT) crystals with high yield
and excellent homogeneity are Modified Horizontal Bridgman (MHB) and High
Pressure Bridgman (HPB) processes, respectively. In this contribution, the
readout system based on two 32-channel NCI-ASICs for pixellated CZT detector
arrays has been developed and tested. The CZT detectors supplied by Orbotech
(MHB) and eV products (HPB) are tested by NCI-ASIC readout system. The CZT
detectors have an array of 8x8 or 11x11 pixel anodes fabricated on the anode
surface with the area up to 2 cm x2 cm and the thickness of CZT detectors
ranges from 0.5 cm to 1 cm. Energy spectra resolution and electron
mobility-lifetime products of 8x8 pixels CZT detector with different
thicknesses have been investigated.
