Background subtraction system for pulsed neutron logging of eart

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

1979-05-04

1980-11-04

Willis, Davis L.

Radiant energy

Coded record and readers; invisible radiant energy type

G01V 500

Patent

active

042322200

ABSTRACT:
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.

REFERENCES:
patent: 3521064 (1970-07-01), Moran et al.
patent: 3780303 (1973-12-01), Smith, Jr. et al.
patent: 3842265 (1974-10-01), Pitts, Jr.
patent: 3886355 (1975-05-01), Culver
patent: 3943362 (1976-03-01), Peelman
patent: 4020342 (1977-04-01), Smith, Jr. et al.

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