The objective of this study was to determine if neutron activation analysis technique can be used to determine the shell content of a sand-shell mixture. To accomplish this aim samples of sand and shell, obtained from different sources, were artificially blended in the laboratory in various proportions and subjected to neutron bombardment by use of a californium-252 source. The gamma of specific energy of emission was then counted and analyzed electronically. The nuclear count was then plotted against the known shell content for development of calibration curves for each combination of sand and shell tested. Statistical analysis of the data indicates a strong linear relationship exists between nuclear count (gamma) and percent shell. Tests resutls for 30 sets of sand-shell mixtures indicated a maximum standard error for any single set to be plus or minus 7.0% of the calibration curve at the 95% confidence level. The mean standard error for the 30 sets tested was plus or minus 4.2%. Sands from different sources may result in widely different nuclear counts after activation. This effect can be negated by generating a separate calibration curve for each source of sand used. /FHWA/

  • Supplemental Notes:
    • Conducted in cooperation with the Department of Transportation Federal Highway Administration.
  • Corporate Authors:

    Louisiana Department of Transportation and Development

    1201 Capitol Access Road, P.O. Box 94245
    Baton Rouge, LA  United States  70804-9245
  • Authors:
    • Melancon, J L
  • Publication Date: 1978-8

Media Info

  • Pagination: 44 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00185282
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-LA-78-123 Final Rpt.
  • Contract Numbers: 72-7S
  • Created Date: Mar 14 1979 12:00AM