First Neutron Computed Tomography with Digital Neutron Imaging Systems in a High-Radiation Environment at the 250 kW Neutron Radiography Reactor at Idaho National Laboratory

First Neutron Computed Tomography with Digital Neutron Imaging Systems in a High-Radiation Environment at the 250 kW Neutron Radiography Reactor at Idaho National Laboratory

Aaron Craft, Burkhard Schillinger, William Chuirazzi, Glen Papaioannou, Andrew Smolinski and Nicholas Boutlon

Abstract. The Neutron Radiography Reactor (NRAD) at Idaho National Laboratory (INL) was designed for thermal and epithermal neutron radiography for examination of highly-radioactive irradiated nuclear fuel elements. Radioactive samples are remotely lowered into the East and North Radiography Stations (ERS and NRS, respectively), and a rail transfer system remotely positions radiography cassettes into the detector position for indirect radiography. The indirect transfer method with film has been used at NRAD for around forty years, but recent efforts seek to develop digital camera-based neutron imaging systems. Two initial camera detector systems were built using an inexpensive but high-quality scientific CMOS camera with robust shielding, and tests were performed in collaboration with Heinz Maier-Leibnitz Institut of Technische Universität München. The first measurements in the ERS provided valuable experience that informed the design of an improved neutron imaging system that was tested in the NRS. The first successful digital neutron computed tomography at INL was acquired, consisting of 421 neutron radiographs acquired in 4 hours. These first tests with camera-based neutron imaging systems have demonstrated the potential to both increase the throughput of radiography by two orders of magnitude and provide higher quality spatial information with three-dimensional tomographic reconstructions compared to two-dimensional radiographic projections, which represent a significant improvement compared to current film radiography capabilities.

Keywords
Neutron Tomography, Neutron Radiography, Computed Tomography

Published online 1/5/2020, 6 pages
Copyright © 2020 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Aaron Craft, Burkhard Schillinger, William Chuirazzi, Glen Papaioannou, Andrew Smolinski and Nicholas Boutlon, First Neutron Computed Tomography with Digital Neutron Imaging Systems in a High-Radiation Environment at the 250 kW Neutron Radiography Reactor at Idaho National Laboratory, Materials Research Proceedings, Vol. 15, pp 42-47, 2020

DOI: https://doi.org/10.21741/9781644900574-7

The article was published as article 7 of the book Neutron Radiography

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] A.E. Craft and J.D. Barton, “Applications of neutron radiography for the nuclear power industry,” Physics Procedia 88 (2017) 73-80. https://doi.org/10.1016/j.phpro.2017.06.009
[2] S.R. Jensen, A.E. Craft, G.C. Papaioannou, W.W. Empie and B.R. Ward, “Reactivation of the Transient Reactor Test (TREAT) Facility neutron radiography program,” in this Proceeding.
[3] A.E. Craft, D.M. Wachs, M.A. Okuniewski, D.L. Chichester, W.J. Williams, G.C. Papaioannou, & A.T. Smolinski, “Neutron radiography of irradiated nuclear fuel at Idaho National Laboratory,” Physics Procedia, 69 (2015) 483-490. https://doi.org/10.1016/j.phpro.2015.07.068
[4] A.E. Craft, G.C. Papaioannou, D.L. Chichester, and W.J. Williams, “Conversion from film to image plates for transfer method neutron radiography of nuclear fuel,” Physics Procedia 88 (2017b) 81-88. https://doi.org/10.1016/j.phpro.2017.06.010
[5] B. Schillinger, E. Lehmann, and P. Vontobel, “3D neutron computed tomography: requirements and applications,” Physica B: Condensed Matter 276 (2000) 59-62. https://doi.org/10.1016/S0921-4526(99)01254-5
[6] A.E. Craft, B.A. Hilton, and G.C. Papaioannou, “Characterization of a neutron beam following reconfiguration of the Neutron Radiography Reactor (NRAD) core and addition of new fuel elements,” Nuc. Eng. & Tech. 48 (2016) 200-210. https://doi.org/10.1016/j.net.2015.10.006
[7] B. Schillinger and A.E. Craft, “A freeware path to neutron computed tomography,” Physics Procedia 88 (2017) 348-353. https://doi.org/10.1016/j.phpro.2017.06.047
[8] B. Schillinger, A. Craft and J. Krüger, “The ANTARES instrument control system for neutron imaging with NICOS/TANGO/LiMA converted to a mobile system used at Idaho National Laboratory,” in this Proceeding.