Method and apparatus for nuclear well logging with optimized tim

Details Method and apparatus for nuclear well logging with optimized tim Method and apparatus for nuclear well logging with optimized tim

1979-11-02

1982-04-27

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250270, G01V 500

Patent

active

043272908

ABSTRACT:
The invention relates to a novel method and apparatus for the cyclical timing of the neutron bursts, spectral gates, tau determination gates, and background measurement periods in a capture spectroscopy measurement. Each measurement cycle period is divided in time into 62 tau units, where tau is the thermal decay time constant determined from the immediately preceding cycle period. The neutron accelerator bursts eight times, each burst lasting for one tau unit and beginning at 0, 6, 12, . . . 42 taus. The capture spectral gates, two units long, follow each neutron burst after a one tau unit long delay. Spectral background due to activation is measured in a long background window until tau equals 61, following a two tau delay from the eighth spectral gate and, properly normalized, is subtracted on a channel-by-channel basis from the spectrum accumulated from the capture spectral gates. Tau determination gates I and II follow each neutron burst after a two tau delay. Each gate I is one tau long; each gate II immediately follows gate I and is two tau long. After the eighth gate II, a long gate III (49 tau to 61 tau) is provided for correcting background counts in the tau determination gates I and II.

REFERENCES:
patent: Re28477 (1975-07-01), Nelligan
patent: 3662179 (1972-05-01), Frentrop et al.
patent: 4055763 (1977-10-01), Antkiw

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