AMP 08 November-December 2023

ADVANCED MATERIALS & PROCESSES | NOVEMBER/DECEMBER 2023 22 neutron imaging team has started to tackle this challenge using the recently developed HyperCT capability, which uses machine learning algorithms to optimize and reconstruct 3D scans. Resonance imaging provides a distinctive ability to quantitatively map elements and isotopes in 3D. The ORNL neutron imaging team is in the process of developing the fitting routines in order to obtain such 3D maps. Finally, the VENUS project will be completed in fall 2024. The beamline will enter a commissioning phase while accepting a limited number of general user proposals. VENUS will be accessible via the general user program in 2025. ~AM&P Acknowledgments: This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors would like to thank Amy Jones, Ian Turnbull, Matthew Balafas, Ryan Mangus, David Conner, Timothy L. Lessard, Stephanie Jolley, Steve Chae, Mark Lyttle, Franz Gallmeier, Irina Popova, Bill McHargue, Justin Bolton, and John Beadles, who also contribute to the VENUS construction project. The authors would also like to thank the SNS support teams for maintaining the SNAP beamline used for this research. This manuscript has been authored by UT-Battelle LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe- public-access-plan). For more information: Hassina Bilheux, senior neutron imaging scientist, Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN, 865.574.0241, bilheuxhn@ornl.gov. References 1. P.J. Withers, et al., X-ray Computed Tomography, Nature Reviews Methods Primers, 1(1), p 18, 2021. Fig. 4 – Illustration of Bragg edge radiography: (a) 5-mm thick FCC Ni powder in aluminum can and sealed with glue on top; (b) Binning of regions prior to mapping the Bragg edge pattern; (c) Ni Bragg edges of FCC Ni powder showing the different lattice planes <hkl> corresponding to the wavelengths; and (d) corresponding wavelength map. Fig. 5 – Neutron transmission as a function of energy: (a) Ta and W resonances showing unique patterns for each material; (b) Isotopic W resonances which allow the identification of different isotopes in the same object. (a) (b) (c) (a) (b) (d)

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