MULTI-LEVEL ATTRIBUTES SAMPLING SCHEMES FOR MATERIAL ACCOUNTANCY VERIFICATION.

In order to verify the declared material accountancy values of a facility, a safeguards authority such as the International Atomic Energy Agency makes its own independent measurements of the contents of items in the material balance on a sampling basis. Because of advances in non-destructive assay technology, a number of alternative measurement methods may be available to make such verification measurements, each with its own level of accuracy and required measurement effort. It is shown how an arbitrary number of such techniques can be combined in an attributes sampling scheme that will guarantee a given probability of detecting a missing goal quantity.