DEVELOPMENTS IN RADIOISOTOPE MEASUREMENT OF SOIL MOISTURE CONTENT AND DENSITY

THE PAPER DESCRIBES RESEARCH AND DEVELOPMENT WORK CARRIED OUT ON THE TECHNIQUE OF DETERMINING THE MOISTURE CONTENT OF SOIL BY NEUTRON IRRADIATION AND DENSITY BY BACK-SCATTERING OF GAMMA RAYS. A NEW INSTRUMENT IS DESCRIBED THAT EMPLOYS A SINGLE RADIUM-BERYLLIUM SOURCE GIVING BOTH NEUTRONS AND GAMMA RAYS. THE SOURCE IS USED IN A SINGLE PROBE FOR SURFACE WORK OR IN A SINGLE DEPTH PROBE FOR MEASUREMENTS OF DEPTH. SOME NEW FEATURES IN THE APPARATUS INCLUDE A MEANS OF CONTROLLING THE EFFECTIVE DEPTH OF WHICH DENSITY IS MEASURED AND THE USE OF SPECIAL REFLECTING DEVICES TO INCREASE THE SENSITIVITY IN MOISTURE DETERMINATIONS. EXTENSIVE STUDIES OF THE VOLUME AND DEPTH OF SOIL MEASURED AND OF THE PROBLEM OF ACHIEVING ACCURATE CALIBRATION OF THE INSTRUMENT OVER THE PRACTICAL RANGE OF MOISTURE CONTENT AND DENSITY ARE DESCRIBED. EXAMPLES OF DIFFERENT FIELDS OF APPLICATION OF THE INSTRUMENT ARE GIVEN. /AUTHOR/

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  • Supplemental Notes:
    • No 309, pp 85-108, 21 FIG, 4 TAB, 8 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
  • Authors:
    • Partridge, T B
    • RIGDEN, P J
  • Conference:
  • Publication Date: 1962

Media Info

  • Media Type: Digital/other
  • Monograph Title: Soil and slope stabilization and moisture and density determination developments
  • Serial:

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Filing Info

  • Accession Number: 00237684
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 19 1994 12:00AM