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Proceedings Paper

Comparative study of Pbl2 and Hgl2 as direct detector materials for high-resolution x-ray image sensors
Author(s): Robert A. Street; Marcelo Mulato; Michael M. Schieber; Haim Hermon; Kanai S. Shah; Paul R. Bennett; Yuri Dmitryev; Jackson Ho; Rachel Lau; Evgenie Meerson; Steve E. Ready; Benjamin Reisman; Y. Sado; Koenraad Van Schuylenbergh; Alexander I. Vilensky; Asaf Zuck
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Paper Abstract

X-ray imaging properties are reported for HgI2 and PbI2, as candidate materials for future direct detection x- ray image sensors, including the first results from screen- printed HgI2 arrays. The leakage current of PbI2 is reduced by using new deposition conditions, but is still larger than HgI2. Both HgI2 and PbI2 have high spatial resolution but new data shows that the residual image spreading of PbI2 is not due to k-edge fluorescence and its possible origin is discussed. HgI2 has substantially higher sensitivity than PbI2 at comparable bias voltages, and we discuss the various loss mechanisms. Unlike PbI2, HgI2 shows a substantial spatially non-uniform response that is believed to originate from the large grain size, which is comparable to the pixel size. We obtain zero spatial frequency DQE values of 0.7 - 0.8 with PbI(subscript 24/ under low energy exposure conditions. A model for signal generation in terms of the semiconducting properties of the materials is presented.

Paper Details

Date Published: 28 June 2001
PDF: 12 pages
Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); doi: 10.1117/12.430858
Show Author Affiliations
Robert A. Street, Xerox Palo Alto Research Ctr. (United States)
Marcelo Mulato, Xerox Palo Alto Research Ctr. (United States)
Michael M. Schieber, Hebrew Univ. of Jerusalem (Israel)
Haim Hermon, Real Time Radiography Readout (Israel)
Kanai S. Shah, Radiation Monitoring Devices, Inc. (United States)
Paul R. Bennett, Radiation Monitoring Devices, Inc. (United States)
Yuri Dmitryev, Radiation Monitoring Devices, Inc. (United States)
Jackson Ho, Xerox Palo Alto Research Ctr. (United States)
Rachel Lau, Xerox Palo Alto Research Ctr. (United States)
Evgenie Meerson, Real Time Radiography Readout (Israel)
Steve E. Ready, Xerox Palo Alto Research Ctr. (United States)
Benjamin Reisman, Real Time Radiography Readout (Israel)
Y. Sado, Hebrew Univ. of Jerusalem (Israel)
Koenraad Van Schuylenbergh, Xerox Palo Alto Research Ctr. (United States)
Alexander I. Vilensky, Real Time Radiography Readout (Israel)
Asaf Zuck, Hebrew Univ. of Jerusalem (Israel)


Published in SPIE Proceedings Vol. 4320:
Medical Imaging 2001: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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