Non-invasive inspection

Details Non-invasive inspection Non-invasive inspection

1989-09-26

1991-01-08

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

2503562, 250303, 25036303, G01T 1169

Patent

active

049838415

ABSTRACT:
Residual core material can be detected inside hollow cast articles using positron emission tomography. Positron radio-isotope material is inducted into any residual core material present by immersing a cast article in an aqueous solution of radio-isotope emitter, for example gallium. Absorbed gallium subsequently emits positrons which are annihilated in collisions with electrons emitting two 511 KeV gamma rays in diametrically opposite directions. The emissions are detected and tracked by a PET camera and the resulting images correlated with a sectioned image of the article as a check on the location of detected core material. Initially a low-dose-rate solution for the purpose of merely establishing the presence of core material is used but a second optional process step introduces a more active solution allowing a PET camera to collect sufficient data to image absorbed isotope.

REFERENCES:
patent: 4531058 (1985-07-01), Burnham et al.
patent: 4697079 (1987-09-01), Stewart et al.
patent: 4735210 (1988-05-01), Goldenberg
patent: 4746795 (1988-05-01), Stewart et al.
patent: 4857736 (1989-08-01), Long
patent: 4868392 (1989-09-01), Wong

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