NDLI: Performance improvement of 3-D position-sensitive pixellated HgI detectors when cooled from room temperature to 10 °C

Content Provider	IEEE Xplore Digital Library
Author	Yuefeng Zhu Kaye, W. Zhong He Feng Zhang
Copyright Year	2010
Description	Author affiliation: Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI, 48109 USA (Yuefeng Zhu; Kaye, W.; Zhong He; Feng Zhang)
Abstract	An experiment to measure the performance of 3-D position-sensitive pixellated HgI crystals cooled below room temperature was carried out using a new ASIC from GammaMedica-Ideas. This ASIC is capable of reading out the digitized pre-amplifier signal waveforms of 121 pixels and the cathode. A significant improvement in energy resolution from 1.48% FWHM at 662keV for the whole detector to 1.09% FWHM is observed on a $18×18×11mm^{3}$ crystal at −4800V cathode bias when the ambient temperature is lowered from 70°F to 50°F (about 10°C). This resolution improvement is partly due to electronic noise reduction in the readout system. However, analysis of the pre-amplifier waveforms showed that changes in crystal properties played a more important role. A correlation between total electron trapping and energy resolution was identified. However, the amount of trapping was found irrelevant to crystal performance. Instead, the non-uniformity of charge collection, namely non-uniformity of the material defects, was believed to be the main contributor to crystal performance.
Starting Page	3959
Ending Page	3962
File Size	257620
Page Count	4
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874558
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pixel Detectors Energy resolution Charge carrier processes Temperature measurement Anodes Semiconductor device measurement
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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