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Metal Thickness Measurements Using Radiography
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
Pagination or Media Count:
The present invention relates broadly to a radiographic inspection technique, and in particular to a metal thickness measurement method using radiography. The localized areas wherein the effective metal thickness is less than the minimum that is required for radiation shielding and which can render a shielding enclosure functionless, is readily determined. The invention comprises a process for assuring metal thickness in small regions. The actual metal thickness of small regions can be verified by comparing the optical densities of sections of the metal i.e. stepwedge. A comparator microphotometer, which compares optical densities of spectrum lines from spectrophotometers, compares the optical density of spectrum lines on an exposed spectrum plate metal under test with a standard plate stepwedge.
APPROVED FOR PUBLIC RELEASE