A portable 2 × 2 digital 3D CZT imaging spectrometer system

A new portable gamma-ray imaging spectroscopy system using three dimensional position-sensitive CdTeZe has been built at the University of Michigan. This system uses a first generation digital VAD_UM ASIC jointly developed by Integrated Detector Electronics AS (IDEAS) and the University of Michigan and allows four 20 × 20 × 15 mm3 CdZnTe detectors to be simultaneously read out in either a full readout mode (where all channels from the triggered ASIC are read out to a personal computer) or in sparse readout mode (only the triggered channel and its neighbors are read out). The performance of the new system in terms of noise, spectroscopy, and isotope identification will be reported. The portable system is able to use standard AC power and is contained in a pelican case 54 × 30 × 32 cm3.