&lt;title&gt;Effect of twin boundaries on the spectroscopic performance of CdZnTe detectors&lt;/title&gt;

Parker, Bradford H.; Stahle, C. M.; Roth, Don J.; Babu, R. Sachidananda; Tueller, J.

doi:10.1117/12.450743

Cited by 10 publications

(3 citation statements)

References 4 publications

(2 reference statements)

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“…We were able to achieve these large dimensions for our detector with the aid of IR scanning and X-ray screening techniques that allowed us to examine CZT wafers in order to find large homogeneous pieces without defects. 5,6 The first generation detector system tested at Goddard was based on a University of Arizona ASIC designed for medical imaging. This ASIC utilized an integrating amplifier mechanism which read out every pixel each readout cycle, had a 64×64 array of 380 µm pixels, and was constructed so that the CZT detector could be directly connected to the ASIC using indium bump bonding.…”

Section: Detector Test Resultsmentioning

confidence: 99%

InFOCuS hard x-ray telescope: pixellated CZT detector/shield performance and flight results

et al. 2003

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The CZT detector on the InFOCµS hard X-ray telescope is a pixellated solid-state device capable of imaging spectroscopy by measuring the position and energy of each incoming photon. The detector sits at the focal point of an 8 m focal length multilayered grazing incidence X-ray mirror which has significant effective area between 20-40 keV. The detector has an energy resolution of 4.0 keV at 32 keV, and the InFOCµS telescope has an angular resolution of 2.2 arcminute and a field of view of about 10 arcminutes. InFOCµS flew on a balloon mission in July 2001 and observed Cygnus X-1. We present results from laboratory testing of the detector to measure the uniformity of response across the detector, to determine the spectral resolution, and to perform a simple noise decomposition. We also present a hard X-ray spectrum and image of Cygnus X-1, and measurements of the hard X-ray CZT background obtained with the SWIN detector on InFOCµS.

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Section: Detector Test Resultsmentioning

confidence: 99%

InFOCuS hard x-ray telescope: pixellated CZT detector/shield performance and flight results

et al. 2003

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“…Producers of CdZnTe have incrementally improved performance, and large detector wafers (~10 cm 2 ) are now available, albeit with the use of careful mapping and selection techniques. 1,2 More recently, Yinnel Tech 3 (CdZnTe) and Acrorad 4 (CdTe) have developed seeded growth techniques that produce ingots that are mostly one single crystal with potentially high detector uniformity and improved yield of large detector substrates. The cost of CdZnTe/CdTe has slowly come down, but these materials are still very expensive compared to scintillators.…”

Section: Semiconductor Detectorsmentioning

confidence: 99%

Prototype AEGIS: a pixel-array readout circuit for gamma-ray imaging

et al. 2005

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Semiconductor detector arrays made of CdTe/CdZnTe are expected to be the main components of future high-performance, clinical nuclear medicine imaging systems. Such systems will require small pixel-pitch and much larger numbers of pixels than are available in current semiconductor-detector cameras. We describe the motivation for developing a new readout integrated circuit, AEGIS, for use in hybrid semiconductor detector arrays, that may help spur the development of future cameras. A basic design for AEGIS is presented together with results of an HSPICE simulation of the performance of its unit cell. AEGIS will have a shaper-amplifier unit cell and neighbor pixel readout. Other features include the use of a single input power line with other biases generated on-board, a control register that allows digital control of all thresholds and chip configurations and an output approach that is compatible with list-mode data acquisition. An 8×8 prototype version of AEGIS is currently under development; the full AEGIS will be a 64×64 array with 300 μm pitch.

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“…CdZnTe is proved to be the most promising material for room temperature X-ray and gamma ray detectors [1] . However, grain boundary limits the performance and the yield of large-volume detectors [2] . In addition，there exists a few studies exploring the electric field distribution in CdZnTe detectors.…”

Section: Introductionmentioning

confidence: 99%