Experience with confirmation measurement at Los Alamos

Confirmation measurements are used at Los Alamos in support of incoming and outgoing shipment accountability and for support of both 235U and Pu inventories. Statistical data are presented to show the consistency of measurements on items of identical composition and on items measured at two facilities using similar instruments. A description of confirmation measurement techniques used in support of 235U and Pu inventories and a discussion on the ability of the measurements to identify items with misstated SNM are given