An imaging neutron/gamma-ray spectrometer

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

doi:10.1117/12.930048

19 October 2012 An imaging neutron/gamma-ray spectrometer

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

Author Affiliations +

Proceedings Volume 8509, Penetrating Radiation Systems and Applications XIII; 850905 (2012) https://doi.org/10.1117/12.930048
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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.

Citation Download Citation

James M. Ryan, Christopher Bancroft, Peter Bloser, Dominique Fourguette, Liane Larocque, Jason Legere, Amanda Madden, Mark L. McConnell, Jane Pavlich, Greg Ritter, Greg Wassick, and Marissa Rousseau "An imaging neutron/gamma-ray spectrometer", Proc. SPIE 8509, Penetrating Radiation Systems and Applications XIII, 850905 (19 October 2012); https://doi.org/10.1117/12.930048

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE