DENSITY AND MOISTURE CONTENT LOGGING - FIRST GENERATION OF NUCLEAR PROBES

DIAGRAPHIES DE DENSITE ET DE TENEUR EN EAU - SONDES NUCLEAIRES DE PREMIERE GENERATION

This report summarizes laboratory studies of nuclear logging probes for measuring the in-situ bulk density and moisture content in boreholes. The measurement of bulk density is effected by means of gamma rays and the moisture content by thermalization of rapid neutrons. To develop the probes the authors used the principle of double detection. By combining data from two sensors, it is possible to partly ignore the irregularities of the borehole diameter. The first part of the report deals with the development of the bulk density measuring probe which uses gamma rays: definition of the radio-element sensors used, source-sensor distance, mechanical filters and discrimination thresholds, calibration method. Part 2 is devoted to the development of the moisture content measuring probe which uses the thermalization of rapid neutrons and facilitates study of the influence of the source-sensor distance and borehole diameter, and the calibration method. The prototype developed from those tests is presented. The importance of measurement conditions is examined for the two devices. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00852643
• Corporate Authors:

  Central Laboratory of Bridges & Highways, France

  75732 Paris,   France 
• Authors:
  • MENARD, J
  • CARIOU, J
• Publication Date: 1978-9

Language

• French

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 44 p.
• Serial:
  • Publication of: Central Laboratory of Bridges & Highways, France
  • Publisher: Central Laboratory of Bridges & Highways, France
  • ISSN: 0085-2643

Subject/Index Terms

• TRT Terms: Backscattering; Boreholes; Calibration; Density; Gamma rays; Installation; Laboratory tests; Logging; Measuring instruments; Methodology; Moisture content; Neutrons; Nuclear probes; Nuclear radiation; Research reports; Technology
• Uncontrolled Terms: Use
• Old TRIS Terms: Borehole loggings
• ITRD Terms: 6160: Back scattering apparatus; 6171: Calibration; 5908: Density; 6706: Gamma ray; 3840: Installation; 5730: Logging; 9102: Method; 5920: Moisture content; 6715: Neutron radiation; 8559: Research report; 3855: Technology; 9084: Use
• Subject Areas: Geotechnology; Highways; Maintenance and Preservation; I41: General Soil Surveys;

Filing Info

• Accession Number: 00314730
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Rapp Rech LPC 82 Monograph
• Files: ITRD, TRIS
• Created Date: Oct 27 1980 12:00AM