Method and apparatus for measuring the thermal neutron...

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

G - Physics

01

V

358/4

G01V 5/00 (2006.01) G01V 5/10 (2006.01)

Patent

CA 1065500

ABSTRACT OF THE DISCLOSURE Circuitry is provided for establishing the points in time at which radiation is detected following each neutron burst in pulsed neutron logging. A signal indicative of the arithmetic mean is generated from which the macroscopic thermal neutron capture cross section of the formation of interest surrounding the borehole is computed. 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.

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