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Patent
G - Physics
01
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G01V 5/00 (2006.01) G01N 23/08 (2006.01) G01T 1/178 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1061916
BACKGROUND SUBTRACTION SYSTEM FOR PULSED NEUTRON LOGGING OF EARTH BOREHOLES Abstract of the Disclosure. 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 micro- seconds. By scaling the gate count rate by a factor of 10, the background is subtracted directly. -1a-
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