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

1976-09-02

1977-08-09

Borchelt, Archie R.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, 250270, G01V 500

Patent

active

040413098

ABSTRACT:
Neutron generator in well logging instrument is pulsed 100 times having a time between pulses of 1400 microseconds. This is followed by an off period of four cycles wherein 2800 microseconds is allowed for capture radiation to decay to an insignificant level and the remaining 2800 microseconds is used to measure background radiation. This results in the neutron source being disabled four pulses after every hundred pulses of operation, or approximately a 4% loss of neutron output. A first detector gate is open from 400 to 680 microseconds and a second detector gate is open from 700 to 980 microseconds. During the 100 cycles, each of the gates is thus open for 280 microseconds times 100 for a total of 28,000 microseconds. By scaling the gate count rate by a factor of 10, the background is subtracted directly.

REFERENCES:
patent: 3566116 (1971-02-01), Nelligan
patent: 3706884 (1972-12-01), Youmans
patent: 4002903 (1977-01-01), Pitts, Jr. et al.

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