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Reference Radiographs are nondestructive testing standards universally accepted because of their high reliability in accept-reject actions.

These reference radiographs for heavy-walled steel castings are applicable to nominal section thicknesses of 4-1/2 to 12 in. ( 114 to 305 mm) and consist of two sets as follows:

--RRE028002 -- (Volume II): 4-MV to 30 MVX Rays.

Each volume consists of three categories of graded discontinuities in increasing levels of severity, and three categories of ungraded discontinuities furnished as examples only.

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