Detection characterization of Cd_1-xZn_xTe detectors for x-ray linear arrays

In this paper, the detected signal-to-noise was measured and related to the tube current (mA) setting. The line spread function amplitude (LSF) dependence on drift distance of a 3mm thick detector, for 100 kVp, 100 mA, with an applied electric field of 50V/mm, and 100 V/mm, were measured. In addition, the dependence of the modulation transfer function (MTF(f)) of the x-ray detector system on the applied bias voltage has been experimentally determined. The experimental setup, although is not offered for large field-of-view imaging applications, offers capabilities for feasibility studies, research and evaluation of the temporal response and noise characteristics of a Cd_1-xZn_xTe detector, for fast digital radiographic and CT applications. The experimental results indicate that Cd_1-xZn_xTe detectors exhibit both a high signal-to-noise ratio and linear response, as well as a good spatial resolution within the diagnostic energy range. tor system improves both with increasing applied bias voltage and decreasing detector thickness. A study is in process aimed at improving the spatial resolution of the x-ray system by suitable optimization of the system geometry as well as the system temporal response.