Methods and apparatus for measuring thermal neutron decay charac

Details Methods and apparatus for measuring thermal neutron decay charac Methods and apparatus for measuring thermal neutron decay charac

1984-07-20

1986-07-15

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

250262, G01V 500

Patent

active

046008381

ABSTRACT:
Methods for measuring thermal neutron decay characteristics of earth formations include the steps of irradiating an earth formation with a discrete burst of fast neutrons, detecting indications of thermal neutron concentration in the formation during a sequence of discrete time gates, determining the zeroth order moment of the indications during the sequence of discrete time gates, and determining the first order moment of the indications during the sequence of discrete time gates, in order to obtain the desired thermal neutron decay characteristic of the earth formation.

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patent: 4409481 (1983-10-01), Smith, Jr. et al.
patent: 4424444 (1984-01-01), Smith, Jr. et al.
"Welex Thermal Multigate Decay Logging", Welex, 3-1983, brochure.
"Computing Thermal Neutron Decay Time Environmental Effects Using Monte Carlo Techniques", Preg and Scott, 10-1981, SPE Paper #10293.

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