B.K. Shah: About the Author
Quality Assurance Division, BARC
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Published Articles
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November/December 2010 Inspectioneering Journal
Rapid industrial and technological growth throughout the world makes it necessary to develop new materials along with advanced Non-Destructive Testing (NDT) Methods to ensure their quality without premature failures. The complex modern system, where materials are required to perform consistently with optimum efficiency, demands stringent quality control of engineered components.
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July/August 2005 Inspectioneering Journal
Radiography is the most widely used volumetric examination technique for non-destructive evaluation of components, as it offers the advantage of direct viewing of the flaw image, judging the type of flaw and provides a permanent record. Flaw characterization methods, described by size, shape & Location, require classification of the type or nature of flaw, position of flaw and flaw severity. Accurate sizing of the flaw to assess its severity is important. ISO Guide 25 "General Requirements for the Competence of Calibration and Testing Laboratories" (1990), requires one to specify the uncertainty of each measurement. In radiography there are several factors which contributes to uncertainty for quantitive measurement. This paper describes a study undertaken to calculate the uncertainty in flaw sizing and to estimate the real size of discontinuities observed in radiography.