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1.1 ,This test method covers the nondestructive assay of scrap and waste items for U, Pu, or both, using a ,252 Cf shuffler. Shuffler measurements have been applied to a variety of matrix materials in containers of up to several 100 L. Corrections are made for the effects of matrix material. Applications of this test method include measurements for safeguards, accountability, TRU, and U waste segregation, disposal, and process control purposes (1, 2, 3).2
1.1.1 ,This test method uses passive neutron coincidence counting (4) to measure the ,240Pu-effective mass. It has been used to assay items with total Pu contents between 0.03 g and 1000 g. It could be used to measure other spontaneously fissioning isotopes such as Cm and Cf. It specifically describes the approach used with shift register electronics, however, it can be adapted to other electronics.