Energy and position resolution of a CdZnTe gamma-ray detector with orthogonal coplanar anodes

Tousignant, O.; Hamel, L. A.; Dufour, P.; Joly, F; Macri, J.; McConnell, Mark L.; Ryan, J. M.; Jordanov, Valentin T.

doi:10.1117/12.366613

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…Our recent work has concentrated on developing a device based on an orthogonal coplanar anode strip design. [14][15][16][17][18] This approach deals effectively with the problem of poor hole transport in CZT that severely limits the usefulness of traditional double-sided strip detectors. It achieves excellent energy resolution and offers the potential for using much thicker detector substrates.…”

Section: Introductionmentioning

confidence: 99%

<title>Three-dimensional imaging and detection efficiency performance of orthogonal coplanar CZT strip detectors</title>

McConnell

Macri

Ryan

et al. 2000

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II

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We report on recent three-dimensional imaging performance and detection efficiency measurements obtained with 5 mm thick prototype CdZnTe detectors fabricated with orthogonal coplanar anode strips. In previous work, we have shown that detectors fabricated using this design achieve both very good energy resolution and sub-millimeter spatial resolution with fewer electronic channels than are required for pixel detectors. As electron-only devices, like pixel detectors, coplanar anode strip detectors can be fabricated in the thickness required to be effective imagers for photons with energies in excess of 500 keV. Unlike conventional double-sided strip detectors, the coplanar anode strip detectors require segmented contacts and signal processing electronics on only one surface. The signals can be processed to measure the total energy deposit and the photon interaction location in three dimensions. The measurements reported here provide a quantitative assessment of the detection capabilities of orthogonal coplanar anode strip detectors.

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Section: Introductionmentioning

confidence: 99%

<title>Three-dimensional imaging and detection efficiency performance of orthogonal coplanar CZT strip detectors</title>

McConnell

Macri

Ryan

et al. 2000

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II

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“…This performance is similar to that recorded in the initial testing of this detector. 10 The response to 662 keV photons from a 137 Cs source of 10 mm thick detector UNH-EV-11 is shown in Figure 10. The effect of electron trapping across the 10 mm thickness is evident in the photopeak pulse height as measured for different interaction depths (Z).…”

Section: Spectroscopymentioning

confidence: 99%

Development of CZT strip detector modules for 0.05- to 1-MeV gamma-ray imaging and spectroscopy

et al. 2003

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We report progress in our study of cadmium zinc telluride (CZT) strip detectors featuring orthogonal coplanar anode contacts. We specifically report on the performance, characterization and stability of 5 and 10 mm thick prototype CZT detectors fabricated using material from several manufacturers. Our ongoing work includes laboratory and simulation studies aimed at optimizing and developing compact, efficient, high performance detector modules for 0.05 to 1 MeV gamma radiation measurements with space-based instrumentation. The coplanar anode strip configuration retains many of the performance advantages of pixel detectors yet requires far fewer electronic channels to perform both 3-d imaging and spectroscopy. Minimizing the channel count is important for large balloon or space instruments including coded aperture telescopes (such as MARGIE or EXIST) and Compton imaging telescopes (such as TIGRE or ACT). We also present plans for developing compact, space qualified imaging modules designed for integration into closely packed large area detector arrays. We discuss issues associated with detector module and array electronics design and development.

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“…Anode-to-steering and steeringto-steering gaps are 200 microns and anodes are separated by 1.1 mm. This pattern was developed to closely approximate the orthogonal co-planar strip design, 16,17 with modification to a hexagonal pattern to conform to the Zebra Pad connector described below. Depending on how the anode and steering electrodes are interconnected, the detector may be operated as a pixel detector with steering electrodes or as a co-planar crossed strip detector.…”

Section: Detector -mentioning

confidence: 99%

CZT detectors with 3D readout for gamma-ray spectroscopy and imaging

Matteson

Pelling

Skelton

2003

X-Ray and Gamma-Ray Detectors and Applications IV

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We are developing 10 mm thick CZT detectors with 3-D readout for ~100 keV to ~1.5 MeV gamma-rays. Multiple-site gamma-ray interactions are fully measured, i.e., the energy and 3-D position of each site are determined. Spatial resolution is 1 mm FWHM. Anode pixel readout with 1 mm pitch is used for x-and y-positions and charge drift times for z-positions. Drift time measurements are triggered by the cathode signal and end when each interaction site's charge cloud reaches an anode pixel. Post-event processing corrects for signal loss due to charge trapping and accurately determines gamma-ray energies, with a goal of 1% energy resolution at 662 keV. Compton kinematic analysis can identify the initial interaction site in most cases as well as constrain the incident gamma-ray direction. Tests were made with a prototype detector, measuring 10 x 10 x 10 mm 3 and operated at 1000 V bias. The measured drift time resolution of 25 nsec FWHM at 662 keV and 60 nsec at 122 keV corresponds to z-position resolution of 0.25 and 0.60 mm FWHM, respectively. The technique is described and results of modeling and tests are presented.

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Energy and position resolution of a CdZnTe gamma-ray detector with orthogonal coplanar anodes

Cited by 7 publications

References 4 publications

<title>Three-dimensional imaging and detection efficiency performance of orthogonal coplanar CZT strip detectors</title>

<title>Three-dimensional imaging and detection efficiency performance of orthogonal coplanar CZT strip detectors</title>

Development of CZT strip detector modules for 0.05- to 1-MeV gamma-ray imaging and spectroscopy

CZT detectors with 3D readout for gamma-ray spectroscopy and imaging

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