Characterization and optimization of CdZnTe Frisch collar gamma-ray spectrometers and their development in an array of detectors

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dc.contributor.author Kargar, Alireza
dc.date.accessioned 2009-08-14T14:00:20Z
dc.date.available 2009-08-14T14:00:20Z
dc.date.issued 2009-08-14T14:00:20Z
dc.identifier.uri http://hdl.handle.net/2097/1665
dc.description.abstract Cadmium Zinc Telluride (CdZnTe) has been used for many applications, such as medical imaging and astrophysics, since its first demonstration as a room temperature operating gamma-ray detector in 1992. The wide band gap, high effective Z-number and high resistivity of CdZnTe make it a good candidate for use as a room temperature operated detector with good absorption efficiency, while maintaining a low bulk leakage current at high electric fields. Nevertheless, the low mobility lifetime products mu tau of holes in CdZnTe makes detectors position sensitive, unless advanced detector designs are employed. Among those designs is the Frisch collar technology which turns the detector into a single carrier device by negating the degrading effects of hole trapping and low mobility. The superiority of the Frisch collar technology over other methods include its inexpensive associated electronics and straight forward fabrication process. The main objective of this research study is to develop a large volume gamma-ray detector with an array of individual CdZnTe Frisch collar gamma-ray spectrometers while still using a single readout. Several goals were to be accomplished prior to the main objective. One goal is to develop a reliable low cost method to fabricate bulk CdZnTe crystals into Frisch collar detectors. Another goal was to investigate the limitations of crystal geometry and the crystal electrical properties to obtain the best spectroscopic performance from CdZnTe Frisch collar detectors. Still another goal was to study all other external parameters such as the collar length, anode to cathode ratio, the insulator thickness and applied voltage on performance of CdZnTe Frisch collar detectors. The final goal was to construct the CdZnTe Frisch collar devices into an array and to show its feasibility of being used for large volume detector. en
dc.description.sponsorship U.S. Department of Energy through NEER Grants DE-FG07-03ID14498 and DE-FG07-04ID14599. Brookhaven National laboratory. en
dc.language.iso en_US en
dc.publisher Kansas State University en
dc.subject CdZnTe en
dc.subject Frisch en
dc.subject Gamma-ray en
dc.subject Detector en
dc.subject Spectrometer en
dc.subject Cadmium Zinc Telluride en
dc.subject CZT en
dc.title Characterization and optimization of CdZnTe Frisch collar gamma-ray spectrometers and their development in an array of detectors en
dc.type Dissertation en
dc.description.degree Doctor of Philosophy en
dc.description.level Doctoral en
dc.description.department Department of Mechanical and Nuclear Engineering en
dc.description.advisor Douglas S. McGregor en
dc.subject.umi Engineering, Nuclear (0552) en
dc.date.published 2009 en
dc.date.graduationmonth August en

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