TY - JOUR
T1 - A 4×4 array module of position-sensitive virtual Frisch-grid CdZnTe detectors for gamma-ray imaging spectrometers
AU - Bolotnikov, A. E.
AU - Camarda, G. S.
AU - De Geronimo, G.
AU - Fried, J.
AU - Hodges, D.
AU - Hossain, A.
AU - Kim, K.
AU - Mahler, G.
AU - Giraldo, L. Ocampo
AU - Vernon, E.
AU - Yang, G.
AU - James, R. B.
N1 - Funding Information:
This work was supported by the U.S. Department of Energy, Office of Defense Nuclear Nonproliferation Research & Development (DNN R&D), Office of International Nuclear Safeguards—Safeguards Technology Development Program, and BNL’s Technology Maturation Award. The manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH1-886 with the U. S. Department of Energy.
PY - 2020/2/21
Y1 - 2020/2/21
N2 - Arrays of position-sensitive virtual Frisch-grid CdZnTe (CZT) detectors offer an economical approach to making high efficiency and high energy resolution gamma cameras for spectroscopy and imaging of radioactive sources. There are many application areas for such instruments including gamma-rays astronomy, medical and industrial imaging, nonproliferation and nuclear safeguards. Here we present the test results from a 4×4 array module coupled to the front-end ASIC. The array houses 16 detectors made of 6×6×20 mm3 CZT crystals. Each crystal is encapsulated inside an ultrathin polyester shell and furnished with four 5-mm-wide charge-sensing pads placed near the anode on each side of the detector. The pad's signals are used to measure X–Y coordinates while the cathode signals give the interaction depths (Z coordinates). Combined together the signals provide 3D position information of the interaction points which can be used to correct the detector response non-uniformity. This allows developers to use standard grade (unselected) CZT crystals while retaining high spectroscopic performance comparable with that of the H3D pixelated detectors. The array's design provides flexibility to replace individual detectors and extend their sizes, potentially increasing upwards of 4 cm in height. We started development of position-sensitive VFG detectors several years ago and today this technology has reached a high-maturity level and is ready to use in practical applications.
AB - Arrays of position-sensitive virtual Frisch-grid CdZnTe (CZT) detectors offer an economical approach to making high efficiency and high energy resolution gamma cameras for spectroscopy and imaging of radioactive sources. There are many application areas for such instruments including gamma-rays astronomy, medical and industrial imaging, nonproliferation and nuclear safeguards. Here we present the test results from a 4×4 array module coupled to the front-end ASIC. The array houses 16 detectors made of 6×6×20 mm3 CZT crystals. Each crystal is encapsulated inside an ultrathin polyester shell and furnished with four 5-mm-wide charge-sensing pads placed near the anode on each side of the detector. The pad's signals are used to measure X–Y coordinates while the cathode signals give the interaction depths (Z coordinates). Combined together the signals provide 3D position information of the interaction points which can be used to correct the detector response non-uniformity. This allows developers to use standard grade (unselected) CZT crystals while retaining high spectroscopic performance comparable with that of the H3D pixelated detectors. The array's design provides flexibility to replace individual detectors and extend their sizes, potentially increasing upwards of 4 cm in height. We started development of position-sensitive VFG detectors several years ago and today this technology has reached a high-maturity level and is ready to use in practical applications.
KW - 3D charge-loss correction
KW - CdZnTe
KW - CdZnTe detectors
KW - Position-sensitive virtual Frisch-grid detectors
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U2 - 10.1016/j.nima.2018.07.090
DO - 10.1016/j.nima.2018.07.090
M3 - Review article
AN - SCOPUS:85052755256
VL - 954
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
M1 - 161036
ER -