Method and apparatus for measuring the thermal neutron absorptio

Details Method and apparatus for measuring the thermal neutron absorptio Method and apparatus for measuring the thermal neutron absorptio

1975-04-02

1977-09-06

Dixon, Harold A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250270, G01V 500

Patent

active

040467643

ABSTRACT:
Circuitry is provided for establishing the points in time at which radiation is detected following each neutron burst in pulsed neutron logging. Means are provided to generate a signal indicative of the arithmetic mean to then compute the macroscopic thermal neutron capture cross section of the formation of interest surrounding the borehole. In one embodiment, an indeterminate number of gates provides a means of establishing the point in time of each pulse indicative of detected radiation. In another embodiment, only a predetermined number of such gates are used. In yet another embodiment, a weighting factor is applied to pulses occurring either before or after the arithmetic mean such that the number of pulses before the arithmetic mean are a multiple of the number occurring after such time.

REFERENCES:
patent: 3133195 (1964-05-01), Jones et al.
patent: 3435216 (1969-03-01), Givens
patent: 3609366 (1971-09-01), Schwartz

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