Abstract: Cadmium Telluride (CdTe) has been investigated for many years as detector operating in the current mode, when illuminated by X- or gamma-ray beams. Indeed, applications in Non Destructive Testing (NDT) and the nuclear medicine field would be quite of interest, due to the relatively lower dose of radiation needed for a similar investigation. In these earlier investigations, three limitations, three limitations appeared drastically: photomemory effect (afterglow), high dark current and instability of this dark current. In a systematic investigation, we have measured by Photo-Induced Current Transient Spectroscopy (PICTS) the afterglow effect of a large number of detectors using various starting materials, with different kinds of compensation or chemical dopants as well as different surface and contact treatments. The main results of this study will be presented, correlated with the microscopic analysis of the material by both PICTS and Thermally Stimulated Current (TSC), in order to reach a clearer picture of the contribution from bulk and surface handlings to the afterglow effect. !12
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