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Abstract
Performance of the (CdZn)Te pixelated detectors heavily relies on the quality of the underlying material. Modern laser-induced transient current technique addresses this problem as a convenient tool for characterizing the associated charge distribution. In this paper, we investigated the charge sharing phenomenon in (CdZn)Te pixel detector as a function of the charge collected on adjacent pixels. The current transients were generated in the defined 4 mm2 spots using 660 nm laser illumination. Waveforms measured on the pixel of interest and its surroundings were used to build the maps of the collected charge at different biases. The detailed study of the maps allowed us to distinguish the charge sharing region, the region with a defect, and the finest part in terms of the performance part of the pixelated anode. We observed the principal inhomogeneity complicating the assignment of the illuminated spot to the nearest pixel.
Highlights
Performance of the (CdZn)Te pixelated detectors heavily relies on the quality of the underlying material
The L-transient current technique (TCT) current transients were measured on the central pixel (CP) anode biased
Laser‐induced TCT (L‐TCT) current transients were measured on the CP was anode biased by at at 400–800 and other pixels unwired to the voltage source
Summary
(CdZn)Te radiation detectors are used in a large variety of gamma and X-ray applications: nuclear safeguards [1,2], high energy astronomy telescopes [3,4], medical X-ray imaging [5], etc. In pixel detectors the strip designs differ from other unipolar detectors, as they detect high energy particles, but particle energy and its position are determined by measuring and comparing the charge collection provide their pinpoint tracking and enable high‐resolution 3D imaging [15]. Once no appropriate correction was carried out, the spectral and space detection deterioration would have appeared [16], since the was carried out, the spectral and space detection deterioration would have appeared [16], since the signal would be evaluated as the simultaneous detection of individual species of lower energies hitting signal would be evaluated as the simultaneous detection of individual species of lower energies different spots This phenomenon is known as the charge sharing effect.
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