Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1984-08-17
1987-07-14
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
378 59, 378 58, G01T 1169
Patent
active
046804706
ABSTRACT:
A nondestructive examination method and apparatus for high resolution detection of cracks, defects or anomalies in radioactivity contaminated materials. The method relies upon radioactivity being carried by the normal reactor environment, or by an added radioactive penetrant fluid, to the cracks, defects or anomalies. Detection of this radioactivity by a narrow well defined beam gives an improved measurement of the location and size of the cracks, defects or anomalies. The apparatus includes a sensor mounted on a remotely controlled framework. The sensor includes shielding to direct a very narrow beam of gamma radiation to a scintillation crystal and photomultiplier tube which converts the radiation into electrical signals. The signals are counted by count rate means and converted to digital form and stored. Survey procedures are provided both for detecting cracks and for characterizing cracks once discovered. Computer aided imaging techniques are provided to construct graphical representations from the recorded data.
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Criscuolo, "Slit Det. by Radiography", Material Evaluation, V. 24, N. 4, Apr., 1966.
Fields Carolyn E.
Hanig: Richard
Schatzel Thomas E.
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