Array of virtual frisch-grid CZT detectors with common cathode readout for correcting charge signals and rejection of incomplete charge-collection events

A. E. Bolotnikov, J. Butcher, G. S. Camarda, Y. Cui, G. De Geronimo, J. Fried, R. Gul, P. M. Fochuk, M. Hamade, A. Hossain, K. H. Kim, O. V. Kopach, M. Petryk, E. Vernon, G. Yang, R. B. James

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

New results from testing an array of 6×6×15 mm 3 virtual Frisch-grid CdZnTe (CZT) detectors with common-cathode readout for charge signals correction and rejection of incomplete charge collection events (ICC) are presented. The array employs parallelepiped-shaped crystals of a large geometrical aspect ratio with two planar contacts on the top and bottom surfaces (anode and cathode) and an additional shielding electrode placed on the sides to create the virtual Frisch-grid effect. The detectors are arranged in 2×2 or 3×3 detector modules with the common cathode readout by a single electronic channel. Because of the common cathode, the length of the shielding electrode can be further reduced with no adverse effects on the device performance. By implementing a novel technique for rejecting ICC events caused by the extended defects, we can achieve good spectral responses from ordinary CZT crystals, which can be produced with higher yield and at lower cost. For such crystals, the resolution of individual detectors is expected to be in the range of 0.8-1.5% FWHM at 662 keV with an average value of 1.3%. Arrays of virtual Frisch-grid detectors offer a robust and low-cost approach for making large-area detection modules that can potentially substitute for more advanced, but also more expensive and less available, pixel detectors in applications with slightly relaxed requirements on position-and energy-resolution (e.g., for coded aperture telescopes). In addition, such virtual Frisch-grid arrays will require a comparably smaller number of readout channels, which allows for lower power consumption.

Original languageEnglish
Article number6170580
Pages (from-to)1544-1551
Number of pages8
JournalIEEE Transactions on Nuclear Science
Volume59
Issue number4 PART 3
DOIs
Publication statusPublished - 2012

Keywords

  • CdZnTe
  • crystal defects
  • virtual Frisch-grid detectors

ASJC Scopus subject areas

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

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    Bolotnikov, A. E., Butcher, J., Camarda, G. S., Cui, Y., De Geronimo, G., Fried, J., Gul, R., Fochuk, P. M., Hamade, M., Hossain, A., Kim, K. H., Kopach, O. V., Petryk, M., Vernon, E., Yang, G., & James, R. B. (2012). Array of virtual frisch-grid CZT detectors with common cathode readout for correcting charge signals and rejection of incomplete charge-collection events. IEEE Transactions on Nuclear Science, 59(4 PART 3), 1544-1551. [6170580]. https://doi.org/10.1109/TNS.2012.2187932