Portable nuclear moisture-density gauge with low activity nuclear sources
Patent
·
OSTI ID:6662586
This patent describes a method of measuring the density of a test material using a low activity gamma radiation source in the presence of a neutron radiation source, comprising: directing fast neutrons from a neutron radiation source into the test material, detecting neutrons which have been moderated and thermalized by neutron moderating elements present in the test material and generating a signal representative of the moisture content of the test material, directing gamma radiation from a gamma radiation source into the test material, detecting gamma radiation emitted from the gamma radiation source and which passes through the test material and generating an uncorrected signal which is representative of the density of the test material plus error due to extraneous background radiation, generating a correction signal which is a function of the moisture signal and which represents the amount of gamma radiation emitted from the test material resulting from the (n, UPSILON) neutron capture reaction due to the presence of neutron capture elements, such as hydrogen, in the test material, and applying the correction signal to the uncorrected density signal to obtain a corrected density signal which is unaffected by background gamma radiation caused by the presence of neutron capture elements in the test material.
- Assignee:
- Troxler Electronic Laboratories, Inc., Research Triangle Park, NC
- Patent Number(s):
- US 4766319
- OSTI ID:
- 6662586
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420500 -- Engineering-- Materials Testing
440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
440300* -- Miscellaneous Instruments-- (-1989)
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
47 OTHER INSTRUMENTATION
DENSIMETERS
DENSITY
DESIGN
DETECTION
EQUIPMENT
GAMMA DETECTION
MATERIALS
MATERIALS TESTING
MEASURING INSTRUMENTS
MOISTURE
MOISTURE GAGES
NEUTRON DETECTION
NONDESTRUCTIVE TESTING
PHYSICAL PROPERTIES
PORTABLE EQUIPMENT
RADIATION DETECTION
RADIOMETRIC GAGES
TESTING
420500 -- Engineering-- Materials Testing
440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
440300* -- Miscellaneous Instruments-- (-1989)
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
47 OTHER INSTRUMENTATION
DENSIMETERS
DENSITY
DESIGN
DETECTION
EQUIPMENT
GAMMA DETECTION
MATERIALS
MATERIALS TESTING
MEASURING INSTRUMENTS
MOISTURE
MOISTURE GAGES
NEUTRON DETECTION
NONDESTRUCTIVE TESTING
PHYSICAL PROPERTIES
PORTABLE EQUIPMENT
RADIATION DETECTION
RADIOMETRIC GAGES
TESTING