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Title: Next Generation Semiconductor-Based Radiation Detectors Using Cadmium Magnesium Telluride

The primary objective of Phase I was to perform extensive studies on the purification, crystal growth and annealing procedures of CdMgTe to gain a clear understanding of the basic material properties to enable production of detector material with performance comparable to that of CdZnTe. Brimrose utilized prior experience in the growth and processing of II-VI crystals and produced high purity material and good quality single crystals of CdMgTe. Processing techniques for these crystals including annealing, mechanical and chemical polishing, surface passivation and electrode fabrication were developed. Techniques to characterize pertinent electronic characteristics were developed and gamma ray detectors were fabricated. Feasibility of the development of comprehensive defect modeling in this new class of material was demonstrated by our partner research institute SRI International, to compliment the experimental work. We successfully produced a CdMgTe detector that showed 662 keV gamma response with energy resolution of 3.4% (FWHM) at room temperature, without any additional signal correction. These results are comparable to existing CdZnTe (CZT) technology using the same detector size and testing conditions. We have successfully demonstrated detection of gamma-radiation from various isotopes/sources, using CdMgTe thus clearly proving the feasibility that CdMgTe is an excellent, low-cost alternative to CdZnTe.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Brimrose Technology Corporation, Sparks Glencoe, MD (United States)
  2. SRI International, Menlo Park, CA (United States)
Publication Date:
OSTI Identifier:
1165052
Report Number(s):
DOE-BTC--11328
14SC500368 (Purchase Request or Funding Document)
DOE Contract Number:
SC0011328
Resource Type:
Technical Report
Research Org:
Brimrose Technology Corporation, Sparks Glencoe, MD (United States)
Sponsoring Org:
USDOE Office Of Science (SC)
Contributing Orgs:
SRI International, Menlo Park, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; 36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 62 RADIOLOGY AND NUCLEAR MEDICINE STTR Report, Gamma-Ray Detectors, Cadmium Magnesium Telluride, Cadmium Zinc Telluride, Nuclear Physics, Wide-Bandgap II-VI Semiconductors, CdTe