Improved performance criteria for use in nuclear gage specifications
Abstract
A laboratory study of nuclear moisture-density gage parameters is reported. Commercial gages were studied to determine the capabilities of present day gages. A research gage was fabricated with a system of precision modular instruments for radiation analysis and measurement and variable gage parameters. Gage geometry, configuration and components could be varied simultaneously or independently. The following gage parameters were investigated: source-detector-(separation, collimation, selection, shielding); gamma photon energy discrimination; and gage configuration. These parameters were evaluated by gage response to changes in moisture, density, soil mineral composition, surface irregularities, temperature and influence by nearby objects. The objective was to develop the criteria necessary to write efficient 'state-of-the-art' specifications for nuclear-moisture density measurement gages for use in highway compaction control.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- May 1975
- Bibcode:
- 1975STIN...7625545C
- Keywords:
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- Densitometers;
- Radiation Measuring Instruments;
- Soil Moisture;
- Performance Tests;
- Radiation Detectors;
- Radiation Sources;
- Specifications;
- Instrumentation and Photography