Gamma-ray density imaging tool

Details Gamma-ray density imaging tool Gamma-ray density imaging tool

G - Physics

01

V

G01V 5/12 (2006.01)

Patent

CA 2600897

An apparatus for investigating underground formations surrounding a borehole, comprises a tool body; a common gamma ray source mounted in the tool body and which, when the apparatus is positioned in a borehole, provides axi-symmetric distribution of gamma rays so as to provide substantially complete circumferential irradiation of the formation surrounding the borehole; and a detector for detecting gamma rays returning from the formation, the detector being responsive to gamma rays from only part of the borehole circumference. A method for investigating underground formations surrounding a borehole with a tool comprising a tool body having a gamma ray source and a detector mounted thereon, comprises irradiating the complete circumference of the borehole wall using a common gamma ray source which provides axi-symmetric distribution of gamma rays; and detecting gamma rays returning from the formation from only part of the borehole circumference.

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