Methods and apparatus for measuring thermal neutron decay characteristics of earth formations
US4600838A · kind A · utility
21Cited by
10References
21Claims
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Key dates
| Filing date | Jul 20, 1984 |
| Grant date | Jul 15, 1986 |
| Priority date | — |
| Expiry date | Jul 20, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/105
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.