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  1. CZT Virtual Frisch-grid Detector [electronic resource] : Principles and Applications

    Washington, D.C. : United States. National Nuclear Security Administration ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2009

    Cadmium Zinc Telluride (CdZnTe or CZT) is a very attractive material for using as room-temperature semiconductor detectors, because it has a wide bandgap and a high atomic number. However, due to the material's poor hole mobility, several special techniques were developed to ensure its suitability for radiation detection. Among them, the virtual Frisch-grid CZT detector is an attractive option, having a simple configuration, yet delivering an outstanding spectral performance. The goal of our group in Brookhaven National Laboratory (BNL) is to improve the performance of Frisch-ring CZT detectors; most recently, that effort focused on the non-contacting Frisch-ring detector, allowing us to build an inexpensive, large-volume detector array with high energy-resolution and a large effective area. In this paper, the principles of virtual Frisch-grid detectors are described, especially BNL's innovative improvements. The potential applications of virtual Frisch-grid detectors are discussed, and as an example, a hand-held gamma-ray spectrometer using a CZT virtual Frischgrid detector array is introduced, which is a self-contained device with a radiation detector, readout circuit, communication circuit, and high-voltage supply. It has good energy resolution of 1.4% (FWHM of 662-keV peak) with a total detection volume of ≈20 cm³. Such a portable inexpensive device can be used widely in nonproliferation applications, non-destructive detection, radiation imaging, and for homeland security. Extended systems based on the same technology have potential applications in industrial- and nuclear-medical-imaging.

    Online OSTI

  2. Enhanced R200 with Frisch-Grid CZT [electronic resource]

    Washington, D.C. : United States. National Nuclear Security Administration ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017

    Current technology using hand-held NaI scintillators with poor energy resolution can be greatly improved upon by using Virtual Frisch Grid-CZT detectors. The CZT semiconductor detectors will provide more reliable isotope identification and more precise measurement of photopeak areas in the presence of strong Compton background. The Virtual Frisch Grid design allows for correction of charge losses that occur at defects with much less expensive industrial grade crystals.

    Online OSTI

  3. Advanced Virtual Frisch-Grid ASIC (AVG-ASIC) [electronic resource]

    Washington, D.C. : United States. National Nuclear Security Administration ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017

    This presentation describes the Advanced Virtual Frisch-Grid ASIC (AVG-ASIC) and its function.

    Online OSTI

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