Prototype CdZnTe Detectors

To help us in the selection process of the best possible detector schemes, we have initiated tests and evaluations in our laboratory of three types of detectors (Links below are to PDF versions of technical papers on these subjects) .

The first detector is a 4x4 array supplied by Metorex, Finland. This detector has detector signal is processed by discreet charge sensitive preamplifiers. We have investigated the energy resolution, photopeak efficiency, and spatial performance.

The second type of detector is a 16x16 pixel array, (1mm to 2mm thick). Pixel size is 250 microns with 300 micron pitch. Detector signal is processed initially by a pixel array chip (PAC5) and then by two SHaper-And-Multiplexer-Read-Out-Chips (SHAMROC) developed by Rutherford Appleton Laboratory, Oxford, UK. Metorex, Finland has supplied these detectors. We have evaluated the noise performance, energy resolution, linearity of the detector's energy response, and the charge sharing and loss properties.

The third detector is also a 16x16 array 2 mm thick. Pixel size is again 250 microns. Detector signal is processed by the ASIC chip, AXGAM, developed by University of California, Riverside. The ASIC is equipped not only to charge sensitive preamplifiers but also with shaping and peak detection. We have reported preliminary results for this detector. This detector has been provided by the University of California, Riverside.