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The IWAS Integrated Waste Assay System is a multi-modality system which provides a combination of active and passive neutron interrogation as well as quantitative gamma analysis. The IWAS system provides a complete NDA suite in a single assay system cavity. The passive neutron cavity is based on the proven Canberra™ HENC™ design and includes the Add-A-Source matrix correction feature. Active neutron interrogation capability is based on the Differential Die Away (DDA) technique to provide sensitive detection of fissile nuclides. Finally a gamma assay module is included to provide quantitative gamma assay results as well as plutonium and/or uranium isotopics results. The NDA 2000™ software automatically evaluates the three modalities to select the best assay result based on user defined criteria. The IWAS system provides the ability to assay the widest variety of TRU waste. The IWAS system can also be used for TRU/LLW sorting.
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