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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:

--RRE018602 -- (Volume II): 2-MV X Rays and Cobalt-60 (called "gamma rays" previously). This includes cobalt-60 or equivalent isotope radiation and from 2-MV up to 4-MV X Rays. Set of 28 plates ( 5 by 8 in.) in a 15 by 17-in. ring binder.

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