Gain stabilized natural gamma ray detection of casing thickness

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

1983-04-08

1984-05-22

Howell, Janice A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250361R, 250369, G01V 500, G01T 120

Patent

active

044503547

ABSTRACT:
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.

REFERENCES:
patent: 2881324 (1959-04-01), Scherbatskoy
patent: 4048495 (1977-09-01), Ellis
patent: 4129777 (1978-12-01), Wahl et al.

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