Radiant energy – Inspection of solids or liquids by charged particles – Including a radioactive source
Patent
1976-01-29
1977-12-20
Willis, Davis L.
Radiant energy
Inspection of solids or liquids by charged particles
Including a radioactive source
250358R, G01N 2300
Patent
active
040644383
ABSTRACT:
A nondestructive system and method for the determination of the presence and extent of hydrogen embrittlement in metals, alloys, and other crystalline structures subject thereto. Positron annihilation characteristics of the positron-electron annihilation within the tested material provide unique energy distribution curves for each type of material tested at each respective stage of hydrogen embrittlement. Gamma radiation resulting from such annihilation events is detected and statistically summarized by appropriate instrumentation to reveal the variations of electron activity within the tested material caused by hydrogen embrittlement therein. Such data from controlled tests provides a direct indication of the relative stages of hydrogen embrittlement in the form of unique energy distribution curves which may be utilized as calibration curves for future comparison with field tests to give on-site indication of progressive stages of hydrogen embrittlement.
REFERENCES:
patent: 3593025 (1971-07-01), Grosskreutz
patent: 3970855 (1976-07-01), Holt et al.
Alex Franklin
Byrne Joseph Gerald
The University of Utah
Willis Davis L.
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