radioactive thickness gage

radioactive thickness gage

[¦rād·ē·ō′ak·tiv ′thik·nəs ‚gāj]
(nucleonics)
An instrument for measuring the thickness of the metal wall of a pipe or tank from one side, by directing a beam of γ-rays through the wall at an angle and measuring the amount of backscattering with a radiation detector.
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