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J. Imaging 2018, 4(2), 40; https://doi.org/10.3390/jimaging4020040

Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE

1
Department of Physics, Worcester Polytechnic Institute, Worcester, MA 01609, USA
2
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)
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Abstract

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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