NDLI: A neutron imaging detector from bundled lithium silicate glass fibers

Content Provider	IEEE Xplore Digital Library
Author	Nagarkar, V.V. Gaysinskiy, V. Bell, Z. Bliss, M. Miller, S. Riley, K.J.
Copyright Year	2009
Description	Author affiliation: Radiation Monitoring Devices Inc. 44 Hunt St. Watertown, MA 02472 USA (Nagarkar, V.V.) \|\| Radiation Monitoring Devices Inc. Watertown, MA 02472 USA (Gaysinskiy, V.; Miller, S.; Riley, K.J.) \|\| Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA (Bell, Z.) \|\| Pacific Northwest National Laboratory, Richland, WA 99352 USA (Bliss, M.)
Abstract	Scientific applications of neutrons ranging from protein crystallography to non-destructive inspections require sensitive neutron detectors having a high spatial resolution that are able to discriminate against unwanted gamma ray events. To address this problem, 2 and 5 mm thick prototype detectors were fabricated as a bundled array of 120 μm diameter cerium activated lithium silicate glass fibers cast in a low-index epoxy resin that helps improve light transmission. Performance of this detector was determined from measured pulse height spectra of isotopic gamma-ray sources and a moderated 10 Ci Am/Li neutron source. Imaging experiments were also performed in a polychromatic neutron beam using an electron-multiplying CCD. 1.5 MeV of electron equivalent light output was determined from pulse height spectra of the bulk glass which is comparable to commercial glasses. Light output for neutron events in the 2 mm thick bundled array was about 50% lower than the bulk sample but gamma rays were similarly affected. The 5 mm thick sample exhibited poorer light output with some asymmetry in the neutron capture peak that is associated with light losses in the fiber bundle. The neutron detection efficiency of the 2 and 5 mm thick detectors was 68 and 98%, respectively. Both detectors successfully imaged patterns fashioned from cadmium neutron absorbers and indicate a spatial resolution of approximately 250 μm. These data demonstrate the feasibility of this approach and further studies are underway to improve overall light output and spatial resolution.
Starting Page	1122
Ending Page	1125
File Size	393557
Page Count	4
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5402405
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Neutrons Lithium Glass Spatial resolution Optical imaging Gamma ray detection Gamma ray detectors Optical arrays Pulse measurements High-resolution imaging scintillation detectors neutron detectors imaging lithium
Content Type	Text
Resource Type	Article

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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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