Also known as: RA#, RA...
RA has various meanings in the Publication category. Discover the full forms, definitions, and usage contexts of RA in Publication.
A non-destructive method of internal examination in which metal objects are exposed to a beam of x-ray or gamma radiation. Differences in thickness, density or absorption, caused by internal defects or inclusions, are apparent in the shadow image either on a fluorescent screen or on photographic film placed behind the object.
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