Abstract
This paper identifies the inspection uncertainty, which is a measure of the difference between the size of imperfection that has a high probability of being passed and the size of imperfection that has a high probability of being rejected by an inspection, as the primary measure of an inspection method, rather than the inspection sensitivity as is often suggested. Reduction of the inspection uncertainty is the only means by which one can simultaneously reduce both type one inspection errors, acceptance of defective material units, and type two inspection errors, rejection of sound material units. The discussion is presented within a framework that allows a quantitative evaluation of the quality of the material units that pass an inspection and a determination of the rejection rate. Analysis of the causes of inspection uncertainty is essential to efficient strategies for improving nondestructive inspection capabilities.
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