MINIMIZING ERRORS IN GAMMA-RAY SURFACE TYPE DENSITY GAGES: EXISTING GAGES AND NEW DESIGN CONCEPTS

BACKSCATTER-TYPE NUCLEAR DENSITY GAGES HAVE BEEN IN EXISTENCE FOR MANY YEARS. THEY HAVE BEEN SLOW IN GAINING WIDESPREAD COMMERCIAL ACCEPTANCE BECAUSE THE QUESTION OF THEIR ACCURACY HAS NOT BEEN SATISFACTORILY RESOLVED. THE ERRORS IS REVIEWED, AND SUGGESTIONS FOR IMPROVING GAGE ACCURACY ON PRESENT-GENERATION COMMERCIAL GAGES ARE INCLUDED. THE DUAL-GAGE PRINCIPLE OFFERS MUCH PROMISE FOR THE IMPROVEMENT OF THE PERFORMANCE OF THESE GAGES. OPTIMUM DUAL-GAGE SYSTEMS ARE BEING DESIGNED ON THE BASIS OF MAXIMIZING A QUALITY FACTOR THAT IS A FUNCTION OF ALL THE GAGE ERRORS AND THE MEASUREMENT VOLUME. TWO PROTOTYPE GAGES HAVE BEEN CONSTRUCTED TO AID IN THIS EVALUATION: ONE USING GEIGER-MULLER-TYPE DETECTORS, AND THE OTHER A SODIUM IODIDE CRYSTAL DETECTOR. RESULTS FROM INITIAL TESTING OF BOTH OF THESE SYSTEMS ARE PRESENTED AND INDICATE THAT A SIGNIFICANT IMPROVEMENT IN ACCURACY IS POSSIBLE. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1970/301/301-005.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Nuclear Principles and Applications and presented at the 49th Annual Meeting. 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:
  • Dunn, William L
  • McDougall, Frank H
• Publication Date: 1970

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 40-52
• Monograph Title: Moisture movement, granular materials and nuclear instrumentation
• Serial:
  • Highway Research Record
  • Issue Number: 301
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Backscattering; Density; Gamma rays; Measurement; Nuclear tests; Sodium compounds
• Old TRIS Terms: Density measurement; Geiger counter; Iodides
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216977
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 3 1970 12:00AM