Performance and simulation of CdZnTe strip detectors as sub-millimeter resolution imaging gamma radiation spectrometers

Mayer, M.; Boykin, D.V.; Cherry, M. L.; Courville, J.F.; Doty, F. Patrick; Drake, A.D.; Guzik, T. G.; Hamel, L. A.; Larson, K.; Macri, J.; McConnell, Mark L.; Ryan, J. M.; Tousignant, O.

doi:10.1109/23.603778

Cited by 20 publications

(9 citation statements)

References 13 publications

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“…The measurement setup and data acquisition electronics is described in reference. 2 The width of the distribution is mainly due to the coffimator diameter. Note that the distribution moves right to left between strips X16 and X15 with each 75 tm step of the collimator but that the difference in the mean position computed by this method is not 75 pm for each step.…”

Section: Imagingmentioning

confidence: 99%

<title>Progress in the study of CdZnTe strip detectors</title>

et al. 1997

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We report new performance measurements and computer simulations of a sub-millimeter pitch CdZnTe strip detector under study as a prototype imaging spectrometer for astronomical X-ray and 7-ray observations. The prototype is 1.5 mm thick with 375 micron strip pitch in both the x and y dimensions. Previously reported work included demonstrations of half-pitch spatial resolution ( 190 microns) and good energy resolution and spectral uniformity. Strip detector efficiency measurements have also been presented. A model that includes the photon interaction, carrier transport and the electronics was developed that qualitatively reproduced the measurements.The new studies include measurements of the CdZnTe transport properties for this prototype in an effort to resolve quantitative discrepancies between the measurements and the simulations. Measurements of charge signals produced by laser pulses and a-rays are used to determine these transport properties. These are then used in the model to predict 7-ray efficiencies that are compared with the data. The imaging performance of the detector is studied by scanned laser and gamma beam spot measurements. The results support the model's prediction of nearly linear sharing of the charge for interactions occurring in the region between electrodes. The potential for strip detectors with spatial resolution much finer than the strip pitch is demonstrated. A new design scheme for strip detectors is shortly discussed.

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Section: Imagingmentioning

confidence: 99%

<title>Progress in the study of CdZnTe strip detectors</title>

et al. 1997

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“…In our earlier work with CZT strip detectors employing orthogonal anode and cathode strips we reported an important detection efficiency limitation related to the poor transport of holes in CZT material. 4 Photons interacting far from the incident cathode surface produce small cathode strip signals. These signals are required to identify the interaction location in one dimension.…”

Section: Motivationmentioning

confidence: 99%

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

Tousignant

Hamel

Dufour

et al. 1999

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

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We report on the simulation, construction and performance of prototype CZT imaging detectors employing orthogonal coplanar anodes. These detectors employ a novel electrode geometry with non-collecting anode strips in one dimension and collecting anode pixels, interconnected in rows, in the orthogonal dimension. These detectors retain the spectroscopic and detection efficiency advantages of single carrier (electrons) charge sensing devices as well as the principal advantage of conventional strip detectors with orthogonal anode and cathode strips, i.e. an N x N array of imaging pixels are realized with only 2N electronic channels. Charge signals induced on the various electrodes of a prototype detector with 8 x 8 unit cells (of 1 x 1 x 5 mm3) are in good agreement with the simulations. The position resolution is about 1 mm in the direction perpendicular to the pixel lines while it is of the order of 1OOjm in the other direction. Energy resolutions of 0.9% at 662 keV, 2.6% at 122 keV and 5.7% at 60 keV have been obtained at room temperature.

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“…I. INTRODUCTION G OOD energy resolution, spectral uniformity and sub-millimeter spatial resolution have been demonstrated with CdZnTe strip detectors 1,2,4,6,7,8]. Recent laser scans accross our strip detector showed a potential for position resolution much smaller than the strip pitch, possibly as good as 10 m 8].…”

mentioning

confidence: 99%

“…An appropriate model for the charge transport and signal generation processes in CdZnTe detectors is an essential tool for understanding the detector performance characteristics and can be used to help specify optimum detector geometries and signal processing electronics for each application 2,3,7,8,9,10,12,13,14,15]. Our model is intended to be an end-to-end tool for simulating all detection and measurement processes from the radiation interaction down to the electronic chain.…”

mentioning

confidence: 99%

Transport properties and performance of CdZnTe strip detectors

Tousignant

Hamel

Courville

et al. 1998

IEEE Trans. Nucl. Sci.

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| We report on recent tests and computer simulations of a sub-millimeter pitch CdZnTe strip detector under study as a prototype imaging spectrometer. This paper presents new measurements and new analyses of previous measurements of the CdZnTe transport properties for this prototype and resolves previously reported quantitative discrepancies. Measurements of charge signals produced by-rays are used to determine the transport properties. These are then used in the model to predict detection e ciencies and spectroscopic performance for-rays that are compared with the data.

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Performance and simulation of CdZnTe strip detectors as sub-millimeter resolution imaging gamma radiation spectrometers

Cited by 20 publications

References 13 publications

<title>Progress in the study of CdZnTe strip detectors</title>

<title>Progress in the study of CdZnTe strip detectors</title>

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

Transport properties and performance of CdZnTe strip detectors

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