Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE

Borges, Nicholas; Losko, Adrian; Vogel, Sven

doi:10.3390/jimaging4020040

Title: Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE

Journal Article · Tue Feb 13 00:00:00 EST 2018 · Journal of Imaging

DOI:https://doi.org/10.3390/jimaging4020040· OSTI ID:1441330

Borges, Nicholas ^[1];

^[2];

^[2]

Worcester Polytechnic Inst., Worcester, MA (United States). Dept. of Physics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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. In this work, 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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1441330

Report Number(s):: LA-UR-18-20230

Journal Information:: Journal of Imaging, Vol. 4, Issue 2; ISSN 2313-433X

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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