TY - JOUR
T1 - Arrays of Position-Sensitive Virtual Frisch-Grid CdZnTe Detectors
T2 - Results from a 4× 4 Array Prototype
AU - Ocampo Giraldo, L. A.
AU - Bolotnikov, A. E.
AU - Camarda, G. S.
AU - Cheng, S.
AU - De Geronimo, G.
AU - McGilloway, A.
AU - Fried, J.
AU - Hodges, D.
AU - Hossain, A.
AU - Unlu, K.
AU - Petryk, M.
AU - Vidal, V.
AU - Vernon, E.
AU - Yang, G.
AU - James, R. B.
N1 - Funding Information:
Manuscript received February 21, 2017; revised May 16, 2017; accepted August 18, 2017. Date of publication August 22, 2017; date of current version October 17, 2017. This work was supported in part by the Office of Nonproliferation and International Security, Office of Nuclear Safeguards and Security, Next Generation Safeguards Initiative’s Safeguards Technology Development Team, and in part by the Brookhaven Science Associates, LLC with the U.S. Department of Energy under Contract DE-AC02-98CH1-886.
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2017/10
Y1 - 2017/10
N2 - Position-sensitive virtual Frisch-grid (VFG) CdZnTe (CZT) detectors offer a unique capability for correcting the response nonuniformities caused by crystal defects. This allowed us to achieve high energy resolution, while using typical-grade commercial CZT crystals with relaxed requirements to their quality, thus reducing the overall cost of detectors. Another advantage of the VFG detectors is that they can be integrated into arrays and used in small compact hand-held instruments or large-area gamma cameras that will enhance detection capability for many practical applications, including nonproliferation, medical imaging, and gamma-ray astronomy. Here, we present the results from testing small array prototypes coupled with front-end application-specified integrated circuit. Each detector in the array is furnished with 5-mm-wide charge-sensing pads placed near the anode. The pads signals are converted into XY coordinates, which combined with the cathode signals (for Z coordinates) provide 3-D position information of all interaction points. The basic array consists of a number of detectors grouped into 2× 2 subarrays, each having a common cathode made by connecting together the cathodes of the individual detectors. These features can significantly improve the performance of detectors while using typical-grade low-cost CZT crystals to reduce the overall cost of the proposed instrument.
AB - Position-sensitive virtual Frisch-grid (VFG) CdZnTe (CZT) detectors offer a unique capability for correcting the response nonuniformities caused by crystal defects. This allowed us to achieve high energy resolution, while using typical-grade commercial CZT crystals with relaxed requirements to their quality, thus reducing the overall cost of detectors. Another advantage of the VFG detectors is that they can be integrated into arrays and used in small compact hand-held instruments or large-area gamma cameras that will enhance detection capability for many practical applications, including nonproliferation, medical imaging, and gamma-ray astronomy. Here, we present the results from testing small array prototypes coupled with front-end application-specified integrated circuit. Each detector in the array is furnished with 5-mm-wide charge-sensing pads placed near the anode. The pads signals are converted into XY coordinates, which combined with the cathode signals (for Z coordinates) provide 3-D position information of all interaction points. The basic array consists of a number of detectors grouped into 2× 2 subarrays, each having a common cathode made by connecting together the cathodes of the individual detectors. These features can significantly improve the performance of detectors while using typical-grade low-cost CZT crystals to reduce the overall cost of the proposed instrument.
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U2 - 10.1109/TNS.2017.2743160
DO - 10.1109/TNS.2017.2743160
M3 - Article
AN - SCOPUS:85028504456
SN - 0018-9499
VL - 64
SP - 2698
EP - 2705
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
IS - 10
M1 - 8014510
ER -