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Proceedings Paper

An imaging neutron/gamma-ray spectrometer
Author(s): James M. Ryan; Christopher Bancroft; Peter Bloser; Dominique Fourguette; Liane Larocque; Jason Legere; Amanda Madden; Mark L. McConnell; Jane Pavlich; Greg Ritter; Greg Wassick; Marissa Rousseau
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Paper Abstract

We present the design and development of a dual-species, neutron/γ-ray imaging spectrometer for the identification and location of radioactive and special nuclear materials (SNM). Real-time detection and identification is important for locating fissile materials. These materials, specifically uranium and plutonium, emit neutrons and γ rays via spontaneous or induced fission. Co-located neutron and γ-ray emissions are a sure sign of fissile material, requiring very few spatially correlated events for a significant detection. Our instrument design detects neutrons and γ rays from all sources in its field of view, constructs images of the emission pattern, and reports the spectra for both species. The detection principle is based upon multiple elastic neutron-proton scatters in organic scintillator for neutrons, and Compton scattering in organic scintillator followed by photoelectric absorption in inorganic scintillator for γ rays. The instrument is optimized for neutron imaging and spectroscopy in the 1-20 MeV range. We recorded images and spectra of a Cf-252 source from 0.5 - 10 MeV, and have done similarly for several γ-ray sources. We report the results of laboratory testing of this expanded instrument and compare them to detailed Monte Carlo simulations using Geant4.

Paper Details

Date Published: 19 October 2012
PDF: 11 pages
Proc. SPIE 8509, Penetrating Radiation Systems and Applications XIII, 850905 (19 October 2012); doi: 10.1117/12.930048
Show Author Affiliations
James M. Ryan, The Univ. of New Hampshire (United States)
Christopher Bancroft, The Univ. of New Hampshire (United States)
Peter Bloser, The Univ. of New Hampshire (United States)
Dominique Fourguette, Michigan Aerospace Corp. (United States)
Liane Larocque, Michigan Aerospace Corp. (United States)
Jason Legere, The Univ. of New Hampshire (United States)
Amanda Madden, The Univ. of New Hampshire (United States)
Mark L. McConnell, The Univ. of New Hampshire (United States)
Jane Pavlich, Michigan Aerospace Corp. (United States)
Greg Ritter, Michigan Aerospace Corp. (United States)
Greg Wassick, Michigan Aerospace Corp. (United States)
Marissa Rousseau, The Univ. of New Hampshire (United States)

Published in SPIE Proceedings Vol. 8509:
Penetrating Radiation Systems and Applications XIII
Gary P. Grim; H. Bradford Barber, Editor(s)

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