Method and apparatus for measuring neutron characteristics...

Details Method and apparatus for measuring neutron characteristics... Method and apparatus for measuring neutron characteristics...

G - Physics

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V

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G01V 5/10 (2006.01) G01N 23/222 (2006.01)

Patent

CA 1149970

METHOD AND APPARATUS FOR MEASURING NEUTRON CHARACTERISTICS OF MATERIAL SURROUNDING A BOREHOLE Abstract of the Disclosure A pulsed source of fast neutrons and a radiation detector system are utilized in a well logging instrument, the detector being responsive to the thermal neutron popu- lation decay rate. The inverse of the decay rate is pro- portional to the measured macroscopic neutron absorption cross-section (Sigma). A Sigma is calculated by taking the natural logarithm of the ratio of the detected radiation counts occurring within two measurement intervals of fixed duration and starting at a fixed time after the neutron burst. This Sigma measurement provides a feedback voltage which is used in altering the starting time of a single measurement interval in a subsequent source pulsing cycle to provide a measured Sigma value.

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