Evaluation of multi-element monolithic CdZnTe arrays for gamma and X-ray imaging

Summary form only given. The properties of a number of multielement, CdZnTe imaging devices for application in industrial radioscopy and axial computed tomography have been investigated. In addition, several 16-element linear arrays as well as a square 64 element 2-D array have been produced and analyzed. All of these devices have been fabricated on single substrates of CdZnTe with vacuum-deposited electrical contacts. The imagers have been evaluated for both the degree and speed of charge collection and their efficiency to X-rays of energies from 20 to 120 keV. Measurements have been conducted to determine energy resolution and rise time as a function of position of interaction within a single pixel volume. The arrays are characterized for uniformity as well as spatial point speed distribution to evaluate their usefulness as X-ray imagers. Read-out systems that use both pulse and current mode sensing have been tested, and their performance have been determined.<
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