Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE
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. 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.
- Authors:
-
- Worcester Polytechnic Inst., Worcester, MA (United States). Dept. of Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- OSTI Identifier:
- 1441330
- Report Number(s):
- LA-UR-18-20230
Journal ID: ISSN 2313-433X
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Imaging
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 2; Journal ID: ISSN 2313-433X
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; energy-resolved neutron imaging; neutron radiography; neutron tomography; centroiding
Citation Formats
Borges, Nicholas, Losko, Adrian, and Vogel, Sven. Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE. United States: N. p., 2018.
Web. doi:10.3390/jimaging4020040.
Borges, Nicholas, Losko, Adrian, & Vogel, Sven. Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE. United States. https://doi.org/10.3390/jimaging4020040
Borges, Nicholas, Losko, Adrian, and Vogel, Sven. Tue .
"Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE". United States. https://doi.org/10.3390/jimaging4020040. https://www.osti.gov/servlets/purl/1441330.
@article{osti_1441330,
title = {Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE},
author = {Borges, Nicholas and Losko, Adrian and Vogel, Sven},
abstractNote = {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.},
doi = {10.3390/jimaging4020040},
journal = {Journal of Imaging},
number = 2,
volume = 4,
place = {United States},
year = {Tue Feb 13 00:00:00 EST 2018},
month = {Tue Feb 13 00:00:00 EST 2018}
}
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