2017 | AFC ACCOMPLISHMENTS 33 Figure 4. a) Initial design of a shielding cask allowing characterization of highly radioactive samples, e.g. irradiated or spent nuclear fuels. The device allows motion of the sample within the cask to enable tomography or diffraction texture measurements with the beam entering and exiting through removable windows. b) A cask used at the Chalk River, Canada, research reactor to characterize spent fuel from that facility by neutron diffraction.