Radiological x-ray response of polycrystalline mercuric-iodide detectors

Michael M. Schieber; Haim Hermon; Robert A. Street; Steve E. Ready; Asaf Zuck; Alexander I. Vilensky; Leonid Melekhov; Rubil Shatunovsky; Evgenie Meerson; Yehezkel Saado

doi:10.1117/12.384520

25 April 2000 Radiological x-ray response of polycrystalline mercuric-iodide detectors

Michael M. Schieber, Haim Hermon, Robert A. Street, Steve E. Ready, Asaf Zuck, Alexander I. Vilensky, Leonid Melekhov, Rubil Shatunovsky, Evgenie Meerson, Yehezkel Saado

Author Affiliations +

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384520
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

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.

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Michael M. Schieber, Haim Hermon, Robert A. Street, Steve E. Ready, Asaf Zuck, Alexander I. Vilensky, Leonid Melekhov, Rubil Shatunovsky, Evgenie Meerson, and Yehezkel Saado "Radiological x-ray response of polycrystalline mercuric-iodide detectors", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384520

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