Examination of PbI2 and HgI2 photoconductive materials for direct detection, active matrix, flat-panel imagers for diagnostic X-ray imaging

Yixiu Kang, Larry E. Antonuk, Youcef El-Mohri, Larry Hu, Yixin Li, Amit Sawant, Zhong Su, Yi Wang, Jin Yamamoto, Qihua Zhao

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

In this paper, the results of empirical studies of the dark current and X-ray signal response of thick, polycrystalline films of lead iodide (FbI 2) and mercuric iodide (HgI2) are reported. These studies are being carried out as part of an extensive, integrated program of research to develop and incorporate such photoconductive, X-ray detection materials into direct detection, active matrix flat-panel imagers (AMFPIs) for applications in diagnostic imaging, as well as for radiotherapy imaging. Simple detector configurations incorporating these materials were prepared by physical vapor deposition (PVD) with thicknesses ranging from approximately 90 to 500 μm. For these detectors, the temporal behavior of the dark current and of the X-ray-induced photocurrent, under irradiation conditions relevant to fluoroscopy, radiography and mammography, were quantitatively examined and are reported. In addition, X-ray sensitivity results are also presented for a variety of conditions. The measurements were performed for externally applied electric fields ranging from 0.2 to 2.0 V/μm for both negative and positive polarities.

Original languageEnglish (US)
Pages (from-to)38-45
Number of pages8
JournalIEEE Transactions on Nuclear Science
Volume52
Issue number1 I
DOIs
StatePublished - Feb 1 2005

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

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