Efficiency measurement on 6.0 cm3 3-D CdZnTe detectors

This work investigate the full energy and total efficiencies of large volume CdZnTe detectors. The efficiencies of three 20 mm × 20 mm × 15 mm pixelated CdZnTPe detectors were measured using the H3Dv2 Application Specific Integrated Circuit (ASIC) readout system developed by Brookhaven National Labo...

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Bibliographic Details
Main Authors: Hao Yang, Feng Zhang, Yuefeng Zhu, Zhong He
Format: Conference Proceeding
Language:English
Subjects:
Application specific integrated circuits
Cathodes
Detectors
Electric fields
Energy resolution
Image edge detection
Pixel
Online Access:Request full text
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Summary:This work investigate the full energy and total efficiencies of large volume CdZnTe detectors. The efficiencies of three 20 mm × 20 mm × 15 mm pixelated CdZnTPe detectors were measured using the H3Dv2 Application Specific Integrated Circuit (ASIC) readout system developed by Brookhaven National Laboratory with un-collimated 241 Am, 137 Cs, and 60 Co sources. One detector was made by eV-Products while the other two were manufactured by Redlen Technologies. Geant4 simulation results are used as the benchmark. The relative efficiency, defined as the ratio between the measured efficiency and the simulated efficiency, is an indicator of the active volume in the detector. The total relative efficiency is close to 100% for all three sources. However, there are deficits on full energy efficiency at higher energies, especially for 60 Co. This loss of full energy efficiency could be due to distorted electric field near the detector side surfaces. Our measurements showed that Redlen detectors have similar efficiency with that of eV-Products detector. The active volume of each detector is more than 90%.
ISSN:1082-3654
2577-0829
DOI:10.1109/NSSMIC.2010.5874513