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J. Imaging 2018, 4(2), 40;

Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE

Department of Physics, Worcester Polytechnic Institute, Worcester, MA 01609, USA
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Author to whom correspondence should be addressed.
Received: 6 December 2017 / Revised: 9 February 2018 / Accepted: 11 February 2018 / Published: 13 February 2018
(This article belongs to the Special Issue Neutron Imaging)
PDF [11185 KB, uploaded 26 February 2018]


The energy-dependence of the neutron cross section provides vastly different contrast mechanisms than polychromatic neutron radiography if neutron energies can be selected for imaging applications. In recent years, energy-resolved neutron imaging (ERNI) with epi-thermal neutrons, utilizing neutron absorption resonances for contrast as well as for quantitative density measurements, was pioneered at the Flight Path 5 beam line at LANSCE and continues to be refined. Here we present event centroiding, i.e., the determination of the center-of-gravity of a detection event on an imaging detector to allow sub-pixel spatial resolution and apply it to the many frames collected for energy-resolved neutron imaging at a pulsed neutron source. While event centroiding was demonstrated at thermal neutron sources, it has not been applied to energy-resolved neutron imaging, where the energy resolution requires to be preserved, and we present a quantification of the possible resolution as a function of neutron energy. For the 55 μm pixel size of the detector used for this study, we found a resolution improvement from ~80 μm to ~22 μm using pixel centroiding while fully preserving the energy resolution. View Full-Text
Keywords: energy-resolved neutron imaging; neutron radiography; neutron tomography; centroiding energy-resolved neutron imaging; neutron radiography; neutron tomography; centroiding

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Borges, N.P.; Losko, A.S.; Vogel, S.C. Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE. J. Imaging 2018, 4, 40.

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