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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 2 to 4-1/2 in. ( 51 to 114 mm) and consist of three separate sets as follows:

-- RRE018603 -- (Volume III): 4-MV to 30-MV X Rays (called " 10 to 24 Mev X rays" previously). Set of 28 plates ( 5 by 8 in.) in a 15 by 17-in. ring binder.

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