2017 | AFC ACCOMPLISHMENTS 105 Figure 1: (a) Tomographic reconstruction of a U-20Pu-10Zr transmutation fuel slug, identifying several inclusions. (b) 2D isotope density maps for a slice including one of the features, indicating a decrease in density at the location of the inclusion for all isotopes characterized. (c) Scan through the reconstructed density in the CT datasets obtained from thermal neutrons (top) and epithermal neutrons (bottom), showing density variations outside and inside the fuel in the density derived from the thermal neutron data, which are artifacts of the CT reconstruction due to the partially complete attenuation of the thermal neutron beam. A B C