Fast neutron computed tomography of multi-material complex objects

Ibrahim Oksuz; Matt Bisbee; Nerine Cherepy; Andrew Townsend; James Hall; Joseph Nicolino; Joseph Tringe; Lei Cao

doi:10.1117/12.2595862

1 September 2021 Fast neutron computed tomography of multi-material complex objects

Ibrahim Oksuz, Matt Bisbee, Nerine Cherepy, Andrew Townsend, James Hall, Joseph Nicolino, Joseph Tringe, Lei Cao

Proceedings Volume 11838, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII; 118380L (2021) https://doi.org/10.1117/12.2595862
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

Fast neutron Computed Tomography (nCT) is a powerful and non-invasive imaging modality that can be used to examine features and defects within low Z elements (such as plastic) hidden or shielded by high Z elements (such as tungsten, lead, or even stainless steel). This study built a fast neutron radiography and nCT system and explored various multi-material complex objects utilizing a fast neutron beam at The Ohio State University Research Reactor (OSURR), which provides ~5.4 x 10^7 n·cm-2·s-1 neutron flux at 1.6 MeV (median energy). The lens-based system includes an Electron Multiplying (EM) CCD camera, a light-tight enclosure, and a high light yield 1 cm thick Polyvinyl Toluene (PVT) scintillator provided by Lawrence Livermore National Laboratory (LLNL). A variety of test exemplars were scanned, with the number of projections for each scan ranging from 90 to 180, covering either 180 or 360 degrees. The exposure time for each projection ranged down to one minute, enabling a full nCT scan within a few hours of operation at a 500-kW low power research reactor. 3D tomograms were constructed using Octopus reconstruction software. Results showed that not only could nCT projection data be successfully constructed into volume data, but good contrast between HDPE and a millimeter-sized tungsten ball could be obtained. The 3D tomography presents high contrast to clearly discern HDPE features and voids inside tungsten shielding that are not discernable using 2D radiography.

Conference Presentation

Citation Download Citation

Ibrahim Oksuz, Matt Bisbee, Nerine Cherepy, Andrew Townsend, James Hall, Joseph Nicolino, Joseph Tringe, and Lei Cao "Fast neutron computed tomography of multi-material complex objects", Proc. SPIE 11838, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII, 118380L (1 September 2021); https://doi.org/10.1117/12.2595862

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