Title :
Evaluation of multi-element monolithic CdZnTe arrays for gamma and X-ray imaging
Author :
Polichar, R. ; Schirato, R. ; Baltgalvis, J. ; Reed, J.
Author_Institution :
Sci. Applications Int. Corp., San Diego, CA, USA
Abstract :
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
Keywords :
X-ray detection and measurement; gamma-ray detection and measurement; position sensitive particle detectors; semiconductor counters; 20 to 120 keV; X-ray imaging; axial computed tomography; charge collection; current mode sensing; efficiency; energy resolution; gamma ray imaging; industrial radioscopy; monolithic CdZnTe arrays; multielement; pulse mode sensing; rise time; spatial point speed distribution; Computed tomography; Computer industry; Contacts; Energy measurement; Energy resolution; Optical imaging; Position measurement; Time measurement; Volume measurement; X-rays;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301181
