Hybrid K-edge densitometry (HKED), a combination of the K-edge and X-ray fluorescence densitometry techniques, is an existing technology that is ideally suited for measurements involving reprocessing plant solutions. It has become the workhorse method in reprocessing plant laboratories around the world. For input solutions, the accuracy associated with HKED measurements approaches that of the more traditional methods, such as isotope dilution mass spectrometry (IDMS). The system has also been used for plutonium product solution measurements in place of IDMS or coulometry when quick turnaround and minimal sample preparation are desired. The most recent application of HKED involves providing quantitative measurements of other minor actinides. This is a major consideration in the U.S. Department of Energy’s Global Nuclear Energy Partnership (GNEP) processing schemes and in the application of other nondestructive assay measurements relying on neutron measurement. Although HKED is not a new technology, currently there are no deployments of HKED systems domestically, with the exception of a single development system at Los Alamos National Laboratory. Oak Ridge National Laboratory (ORNL) has been working to procure and install an HKED system at the ORNL Radiochemical Engineering Development Center, the site for the GNEP Coupled End-to- End (CETE) Demonstration. Because actual spent fuel dissolver solutions will be available, the potential for multiple applications and opportunities involving an HKED system exists. The reintroduction of HKED technology in the production environment of the CETE Demonstration will not only offer an unprecedented opportunity for U.S. users to gain experience domestically, but will also provide a qualification testing center for upgrades and changes to HKED systems worldwide, a need expressed by the International Atomic Energy Agency and the U.S. Support Program.
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