A 4×4 array module of position-sensitive virtual Frisch-grid CdZnTe detectors for gamma-ray imaging spectrometers

A. E. Bolotnikov, G. S. Camarda, G. De Geronimo, J. Fried, D. Hodges, A. Hossain, Kihyun Kim, G. Mahler, L. Ocampo Giraldo, E. Vernon, G. Yang, R. B. James

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

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gamma ray spectrometers
imaging spectrometers
Gamma rays
Spectrometers
modules
grids
Detectors
Imaging techniques
detectors
Crystals
crystals
gamma ray astronomy
Astronomy
application specific integrated circuits
photographic developers
polyesters
Application specific integrated circuits
retaining
nonuniformity
Light sources

Keywords

  • 3D charge-loss correction
  • CdZnTe
  • CdZnTe detectors
  • Position-sensitive virtual Frisch-grid detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

A 4×4 array module of position-sensitive virtual Frisch-grid CdZnTe detectors for gamma-ray imaging spectrometers. / Bolotnikov, A. E.; Camarda, G. S.; Geronimo, G. De; Fried, J.; Hodges, D.; Hossain, A.; Kim, Kihyun; Mahler, G.; Giraldo, L. Ocampo; Vernon, E.; Yang, G.; James, R. B.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 01.01.2018.

Research output: Contribution to journalArticle

Bolotnikov, A. E. ; Camarda, G. S. ; Geronimo, G. De ; Fried, J. ; Hodges, D. ; Hossain, A. ; Kim, Kihyun ; Mahler, G. ; Giraldo, L. Ocampo ; Vernon, E. ; Yang, G. ; James, R. B. / A 4×4 array module of position-sensitive virtual Frisch-grid CdZnTe detectors for gamma-ray imaging spectrometers. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2018.
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AU - Hodges, D.

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AU - Kim, Kihyun

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