This safeguards paper by Lawrence Livermore National Laboratory (Dreyer and Burks) and PHDS (Ethan Hull) presents the GeGI, described as the first portable, mechanically cooled germanium gamma imager, offering a 4-pi field of view in a package measuring 30 by 15 by 23 cm and weighing about 15 kg. Imaging complements traditional non-destructive assay by adding spatial detection, identification, and characterization of nuclear material, and supports design information verification. Measurements at the Paducah Gaseous Diffusion Plant demonstrated identification and localization of LEU, HEU, and plutonium, and deployments at the Savannah River Site characterized radioactive waste canisters.
