On the Active Volume of Cadmium Zinc Telluride Gamma-Ray Spectrometers

1997 ◽  
Vol 487 ◽  
Author(s):  
J. C. Lund ◽  
B. A. Brunett ◽  
T. P. Viles ◽  
N. R. Hilton ◽  
R. B. James
Keyword(s):  
Gamma Ray ◽  
Cadmium Zinc Telluride ◽  
Pulse Height ◽  
Zinc Telluride ◽  
Charge Trapping ◽  
Active Volume ◽  
Electronic Signal Processing ◽  
Czt Detectors ◽  
Unipolar Devices ◽  
Cadmium Zinc

AbstractIn this paper we develop quantitative models to predict the active volume of cadmium zinc telluride (CZT) detectors operated as gamma-ray pulse height spectrometers. Three cases are considered: a conventional planar detector, a unipolar device, and a detector in which electronic signal processing has been applied to correct for charge trapping effects. We find that existing detectors are very limited in their maximum attainable active volume, but unipolar devices with charge correction show promise for producing large active volume devices.

Recent advances in the development of high-resolution 3D cadmium–zinc–telluride drift strip detectors

2020 ◽  
Vol 27 (6) ◽  
pp. 1564-1576
Author(s):  
Leonardo Abbene ◽  
Gaetano Gerardi ◽  
Fabio Principato ◽  
Antonino Buttacavoli ◽  
Saverio Altieri ◽  
...  
Keyword(s):  
High Resolution ◽  
Room Temperature ◽  
Gamma Ray ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
Strip Detectors ◽  
Correction Technique ◽  
Wide Range ◽  
Induced Charge ◽  
Cadmium Zinc

In the last two decades, great efforts have been made in the development of 3D cadmium–zinc–telluride (CZT) detectors operating at room temperature for gamma-ray spectroscopic imaging. This work presents the spectroscopic performance of new high-resolution CZT drift strip detectors, recently developed at IMEM-CNR of Parma (Italy) in collaboration with due2lab (Italy). The detectors (19.4 mm × 19.4 mm × 6 mm) are organized into collecting anode strips (pitch of 1.6 mm) and drift strips (pitch of 0.4 mm) which are negatively biased to optimize electron charge collection. The cathode is divided into strips orthogonal to the anode strips with a pitch of 2 mm. Dedicated pulse processing analysis was performed on a wide range of collected and induced charge pulse shapes using custom 32-channel digital readout electronics. Excellent room-temperature energy resolution (1.3% FWHM at 662 keV) was achieved using the detectors without any spectral corrections. Further improvements (0.8% FWHM at 662 keV) were also obtained through a novel correction technique based on the analysis of collected-induced charge pulses from anode and drift strips. These activities are in the framework of two Italian research projects on the development of spectroscopic gamma-ray imagers (10–1000 keV) for astrophysical and medical applications.

Control of Defects and Impurities in Production of CdZnTe Crystals by the Bridgman Method

1997 ◽  
Vol 487 ◽  
Author(s):  
H. L. Glass ◽  
A. J. Socha ◽  
D. W. Bakken ◽  
V. M. Speziale ◽  
J. P. Flint
Keyword(s):  
High Purity ◽  
Gamma Ray ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
Infrared Transmission ◽  
Detector Arrays ◽  
Plane Detector ◽  
Vertical Bridgman ◽  
Cadmium Zinc

AbstractCadmium zinc telluride crystals were grown by vertical Bridgman processes using in situ compounding from high purity elements into pyrolytic boron nitride crucibles within sealed fused quartz ampoules containing cadmium vapor at a pressure of roughly one atmosphere. These conditions produce material having the low etch pit density, low precipitate density, high infrared transmission and high purity required for use as substrates for infrared focal plane detector arrays fabricated in epitaxial mercury cadmium telluride. Similar processes should be satisfactory for producing cadmium zinc telluride for gamma ray detectors.

scholarly journals Modern possibilities of cardiovascular imaging using gamma cameras with cadmium–zinc–telluride-detectors

2020 ◽  
Vol 24 (3) ◽  
pp. 11
Author(s):  
S. M. Minin ◽  
K. V. Zavadovky ◽  
N. A. Nikitin ◽  
A. V. Mochula ◽  
A. B. Romanov
Keyword(s):  
Conflict Of Interest ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
Diagnostic Tools ◽  
Cardiac Spect ◽  
Gamma Cameras ◽  
Non Invasive ◽  
Flow Reserve ◽  
Czt Detectors ◽  
Cadmium Zinc

<p>Myocardial perfusion imaging is considered one of the leading non-invasive diagnostic tools for the assessment of patients with known or suspected coronary artery disease and other cardiac pathologies. The technical improvement of the currently used gamma-tomographic devices has increased the diagnostic capability of this technique. In recent years, the use of dedicated cardiac SPECT cameras with solid-state cadmium–zinc–telluride (CZT) technology has increased in nuclear imaging. These new CZT technologies have several advantages over existing scanner models. The development of new CZT detectors and their collimator configuration has increased scanning sensitivity and spatial resolution values. Also, due to the significantly higher sensitivity of new CZT detectors and new methods of data processing, radiologists have already introduced new scanning protocols and methods for radionuclide assessment of myocardial blood flow, reserve and non-invasive visualisation of the functioning of the sympathetic nervous system into clinical practice. The purpose of this review is to provide data on the main technical characteristics of gamma cameras equipped CZT detectors as well as the current possibilities of using CZT cameras for examining patients with various cardiovascular diseases.</p><p>Received 1 April 2020. Revised 22 April 2020. Accepted 30 April 2019.</p><p><strong>Funding:</strong> The work is supported by a grant of the Russian Science Foundation No. 17-75-20118.</p><p><strong>Conflict of interest:</strong> Authors declare no conflict of interest.</p><p><strong>Author contributions</strong><br />Conception and study design: S.M. Minin, K.V. Zavadovky, A.B. Romanov<br />Drafting the article: S.M. Minin, K.V. Zavadovky, N.A. Nikitin, A.V. Mochula, A.B. Romanov<br />Critical revision of the article: S.M. Minin, K.V. Zavadovky<br />Final approval of the version to be published: S.M. Minin, K.V. Zavadovky, N.A. Nikitin, A.V. Mochula, A.B. Romanov</p>

scholarly journals Gamma-ray peak shapes from cadmium zinc telluride detectors

1996 ◽  
Author(s):  
M.N. Namboodiri ◽  
A.D. Lavietes ◽  
J.H. McQuaid
Keyword(s):  
Gamma Ray ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
Cadmium Zinc
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