NDLI: A compact scintillator-based coded aperture imager for localizing illicit nuclear materials

Content Provider	IEEE Xplore Digital Library
Author	Vaska, P. Vanier, P.E. Junnarkar, S. Krishnamoorthy, S. Pratte, J.-F. Stoll, S.
Copyright Year	2007
Description	Author affiliation: Brookhaven Nat. Lab., Upton (Vaska, P.; Vanier, P.E.; Junnarkar, S.; Krishnamoorthy, S.; Pratte, J.-F.; Stoll, S.)
Abstract	Efficient detection, localization, and identification of illicit nuclear materials is a critical need for national security. Gamma-ray signatures can be exploited for these purposes, but very high detection efficiency is needed in addition to a practical design that can be effective in the field. Modern, dense scintillators with low intrinsic background provide the highest detection efficiency (albeit at somewhat lower energy resolution than semiconductor detectors), and solid-state photodetector readout of the scintillation light can enable a compact and robust design compared to conventional photomultiplier tubes. We explore the feasibility of a coded aperture gamma-ray imager which combines gadolinium oxyorthosilicate scintillator (GSO) and avalanche photodiode (APD) readout. Each GSO crystal is 5 times 5 mm in cross-section and 25 mm long, and is coupled to a Hamamatsu S8664-55 APD with matching active area. 225 detectors are arrayed in a 15 times 15 matrix within a tungsten shield box. Readout is effected with a custom PC board which includes multiple 32-channel ASICs to handle preamplification, shaping, and energy and time discrimination. The output is fed to a compact data acquisition system originally designed for medical imaging with the RatCAP PET system. Various coded aperture designs are being evaluated for optimal imaging performance. Detector design and performance are presented.
Starting Page	1195
Ending Page	1197
File Size	422351
Page Count	3
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4437220
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Apertures Solid scintillation detectors National security Gamma ray detection Gamma ray detectors Energy resolution Solid state circuits Photodetectors Robustness Photomultipliers
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
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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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