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a. A nondestructive method of internal examination in which metal or other
objects are exposed to a beam of X-ray or gamma radiation. Differences in
thickness, density, or absorption caused by internal discontinuities are
apparent in the shadow image either on a fluorescent screen or on a
photographic film placed behind the objects. ASM, 1
b. The use of penetrating ionizing radiation to examine solid material.
When the source of radiation is internal, such as an implanted radioactive
tracer, the technique is known as autoradiography. Lyman
Source:
Dictionary of Mining, Mineral, and Related Terms
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