Analysis using neutrons
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United States of America Patent
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Nov 26, 1991
Issued Date -
N/A
app pub date -
Mar 19, 1990
filing date -
Nov 12, 1987
priority date (Note) -
Expired
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Abstract
A tool suitable for borehole logging, including production oilwell borehole logging, contains a radioisotope neutron source (14), a fast neutron detector (15) and a gamma-ray detector (16). Gamma-ray detection events are selected for building spectra by coincidence or anticoincidence with detection of the associated neutron. In a development, additional information is derived from identification of which of a series of time intervals encompasses detection of a neutron after detection of a gamma-ray.
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