Background subtraction system for pulsed neutron logging of...

Details Background subtraction system for pulsed neutron logging of... Background subtraction system for pulsed neutron logging of...

G - Physics

01

V

358/4

G01V 5/10 (2006.01)

Patent

CA 1147869

BACKGROUND SUBTRACTION SYSTEM FOR PULSED NEUTRON LOGGING OF EARTH BOREHOLES ABSTRACT OF THE DISCLOSURE The composition of an earth formation is investigated by repetitively irradiating the formation with bursts of fast neutrons and generating an inelastic energy spectrum from gamma ray counts detected during first time intervals which are contemporaneous with the bursts. A second energy spectrum is generated from gamma ray counts detected during second time intervals which immediately follow respective first time intervals. Gamma ray counts comprising the second spectrum are thereafter subtracted from the gamma ray counts comprising the inelastic spectrum to provide an inelastic energy spectrum with reduced background.

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