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Highly energetic, cosmic-ray muons can easily penetrate a dry storage caskand yield information about the material inside it by making use of the physicsof multiple Coulomb scattering. Work by others has shown this information maybe used for verification of dry storage cask contents after continuity ofknowledge has been lost. In our modeling and simulation approach, we use idealplanar radiation detectors to record the trajectories and momentum of bothincident and exiting cosmic ray muons; this choice allows us to demonstrate thefundamental limit of the technology for a particular measurement andreconstruction method. In a method analogous to computed tomography withattenuation coefficient replaced by scattering density is we apply a filteredback projection algorithm in order to reconstruct both the geometry andmaterial information in modeled scenarios for concrete-walled cask VSC-24. Ascenario where one of the middle four spent nuclear fuel assemblies is missingundetectable with a simple PoCA-based approach is expected to be readilydetectable with CT-based approach. Moreover, a trickier scenario where the oneor more assemblies is replaced by dummy assembly is put forward. In this case,we expect that this dry storage cask should be found to be not as declaredbased on our simulation and reconstruction results. Furthermore, we show thatthe material composition can be estimated if the momentum of individual muonscan be precisely measured.

Detection of Missing Assemblies and Estimation of the Scattering  Densities in a VSC-24 Dry Storage Cask with Cosmic-Ray-Muon-Based Computed  Tomography