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Dual-spaced epithermal neutron detector porosity logging with AcBe source

Patent ·
OSTI ID:7262053
A relatively high intensity (10/sup 8/ neutrons/sec) actinium-beryllium neutron source irradiates earth formations surrounding a well borehole. Two cadmium-wrapped /sup 3/He detectors spaced at about 46 and 76 cm from the neutron source measure the epithermal neutrons deflected back to the borehole. The ratio of the counting rates in the two detectors is related to the earth formation porosity.
Assignee:
Texaco, Inc.
Patent Number(s):
US 3906224
OSTI ID:
7262053
Country of Publication:
United States
Language:
English

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Related Subjects

440105 -- Radiation Instrumentation-- Radiometric Instruments-- (-1987)
440400* -- Well Logging Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
47 OTHER INSTRUMENTATION
ACTINIDES
ACTINIUM
ALKALINE EARTH METALS
BARYONS
BERYLLIUM
COUNTING RATES
ELEMENTARY PARTICLES
ELEMENTS
EPITHERMAL NEUTRONS
EQUIPMENT
FERMIONS
HADRONS
HE-3 COUNTERS
MEASURING INSTRUMENTS
METALS
NEUTRON DETECTION
NEUTRON DETECTORS
NEUTRON LOGGING
NEUTRON SOURCES
NEUTRON-NEUTRON LOGGING
NEUTRONS
NUCLEONS
PARTICLE SOURCES
POROSIMETERS
POROSITY
PROPORTIONAL COUNTERS
RADIATION DETECTION
RADIATION DETECTORS
RADIATION SOURCES
RADIOACTIVITY LOGGING
WELL LOGGING