Method and apparatus for induced gamma ray logging

Details Method and apparatus for induced gamma ray logging Method and apparatus for induced gamma ray logging

1983-02-24

1986-06-24

Anderson, Bruce C.

Radiant energy

Coded record and readers; invisible radiant energy type

250262, G01V 510

Patent

active

045969272

ABSTRACT:
In a neutron induced gamma ray well logging instrument, a neutron generator is pulsed at a preselected clock frequency. Each neutron burst produces inelastic scattering gamma rays and capture gamma rays. Inelastic scattering gamma rays are detected using a bismuth germanate scintillator during a first time interval coinciding with the neutron source being on. Capture gamma rays are detected by bismuth germanate scintillator during a second interval subsequent to the termination of each neutron burst. The detected pulses are converted into electrical pulses by a photomultiplier. The electrical pulses are coupled into processing circuitry. The use of address decoders, subtractors and ratio circuits enables measurements of the characteristic full-energy photopeaks of selected elements within the formations.

REFERENCES:
patent: 4136278 (1979-01-01), Oliver
patent: 4232220 (1980-11-01), Hertzog
patent: 4446369 (1984-05-01), Givens et al.
patent: 4454420 (1984-06-01), Smith, Jr.

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