The purpose of NDT is to reduce uncertainty. Thus, reliability is paramount. At the same time, NDT is always pushed to find the smallest possible defects to the limits of its reliability. This presentation reviews the factors affecting NDT reliability and introduces probability of detection (POD) as a tool to assess inspection reliability. The commonly used methodologies (hit/miss and â vs. a) are introduced and the associated assumptions and recommended fields of application are reviewed. Reliability and its evaluation is viewed from the inspector's point of view: what the inspector can do to improve reliability and how different aspects of inspection affect reliability.
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