CONCRETE ANALYSIS BY NEUTRON-CAPTURE GAMMA RAYS USING CALIFORNIUM 252

THE FEASIBILITY OF ANALYZING CONCRETE AND CEMENT BY A MEASUREMENT OF THE NEUTRON-CAPTURE OR PROMPT GAMMA RAYS WAS INVESTIGATED; A 100-MICRO-G CALIFORNIUM-252 SOURCE WAS USED TO SUPPLY THE NEUTRONS. A LITHIUM DRIFTED GERMANIUM CRYSTAL DETECTED THE CAPTURE GAMMA RAYS EMITTED. THE CAPTURE GAMMA RAYS FROM CEMENT, SAND, AND 3 COARSE AGGREGATES-QUARTZITE GRAVEL, LIMESTONE, AND DIABASE-WERE STUDIED. CONCRETE BLOCKS MADE FROM THESE MATERIALS WERE THEN TESTED. THE CAPTURE GAMMA RAY RESPONSE OF THE CALCIUM, SILICON, AND IRON IN THE CONCRETE BLOCKS WAS IN ACCORD WITH THE ELEMENTS IDENTIFIED IN THE MIX MATERIALS. THE PRINCIPAL SPECTRAL LINES USED WERE THE 6.42 MEV LINE OF CALCIUM, THE 4.93 MEV LINE OF SILICON, AND THE DOUBLET OF IRON AT ABOUT 7.64 MEV. THE ALUMINUM LINE AT 7.72 MEV WAS OBSERVED IN SOME CASES, BUT AT A LOWER INTENSITY WITH THE LIMITED ELECTRONIC EQUIPMENT AVAILABLE. THIS NUCLEAR SPECTROSCOPIC TECHNIQUE OFFERS A POSSIBLE METHOD OF DETERMINING THE COMPONENTS OF SIZABLE CONCRETE SAMPLES IN A NONDESTRUCTIVE, IN SITU MANNER. IN ADDITION, THE NEUTRON-CAPTURE GAMMA RAY TECHNIQUE MIGHT FIND APPLICATION IN CONTROL OF THE CONCRETE AND CEMENT PROCESSES AND FURNISH NEEDED INFORMATION ON PRODUCTION OPERATIONS AND INVENTORIES.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 13-24
  • Monograph Title: Nuclear applications, pipe corrosion and aggregate and glass bead testing
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00214203
  • Record Type: Publication
  • ISBN: 0309020840
  • Files: TRIS, TRB
  • Created Date: Apr 17 1973 12:00AM