Gain stabilized natural gamma ray detection of casing...

Details Gain stabilized natural gamma ray detection of casing... Gain stabilized natural gamma ray detection of casing...

G - Physics

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358/3

G01T 1/40 (2006.01) E21B 47/08 (2006.01) G01V 5/06 (2006.01)

Patent

CA 1217881

GAIN STABILIZED NATURAL GAMMA RAY DETECTION OF CASING THICKNESS IN A BOREHOLE (Docket No. WPC-82) ABSTRACT OF THE DISCLOSURE A gain stabilized natural gamma ray spectroscopy system is used to measure casing thickness in a cased well borehole. A ratio of gamma ray intensity in two selected energy ranges forms a measurement signal representative of casing thickness based on the photoelectric absorption of natural gamma rays by iron. A coincidence technique employing dual scintillation crystals and a stabilization source of charged particles and known energy gamma rays is used for gain stabilization. -I-

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