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Proceedings Paper

Radiological x-ray response of polycrystalline mercuric-iodide detectors
Author(s): Michael M. Schieber; Haim Hermon; Robert A. Street; Steve E. Ready; Asaf Zuck; Alexander I. Vilensky; Leonid Melekhov; Rubil Shatunovsky; Evgenie Meerson; Yehezkel Saado
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Paper Abstract

A first image of some tiny screws were obtained for the first time with polycrystalline HgI2 acting as the photoconductor material deposited on a-Si direct conversion X- ray image sensors, produced by Xerox -- Palo Alto Research Center. The initial results are very promising and show a high X-ray sensitivity and low leakage current. The response of these detectors to a radiological X-ray generator of 65 kVp has been studied using the current integration mode. Already its sensitivity expressed in (mu) C/R*cm2, is very high, values of 20 (mu) C/R*cm2 have been measured for films of 100 - 250 microns thickness and bias of 50 - 200 volts respectively, which is superior to the published data for competing materials such as polycrystalline PbI2 and a-Se detectors. The fabrication and characterization measurements of the Polycrystalline HgI2 thick film detectors will be given. The characterization data which will be reported here consists of: (a) sensitivity, (b) dark currents, (c) stability of sensitivity dependence on the number of exposure, (d) X-ray response dependence on dose energy and (e) signal decay dependence on the number of exposures.

Paper Details

Date Published: 25 April 2000
PDF: 8 pages
Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); doi: 10.1117/12.384520
Show Author Affiliations
Michael M. Schieber, Hebrew Univ. of Jerusalem (Israel) and Sandia National Labs. (Israel)
Haim Hermon, Real Time Radiography Readout (Israel)
Robert A. Street, Xerox Palo Alto Research Ctr. (United States)
Steve E. Ready, Xerox Palo Alto Research Ctr. (United States)
Asaf Zuck, Hebrew Univ. of Jerusalem (Israel)
Alexander I. Vilensky, Real Time Radiography Readout (Israel)
Leonid Melekhov, Real Time Radiography Readout (Israel)
Rubil Shatunovsky, Real Time Radiography Readout (Israel)
Evgenie Meerson, Real Time Radiography Readout (Israel)
Yehezkel Saado, Hebrew Univ. of Jerusalem and Real Time Radiography Readout (Israel)


Published in SPIE Proceedings Vol. 3977:
Medical Imaging 2000: Physics of Medical Imaging
James T. Dobbins; John M. Boone, Editor(s)

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