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Apparatus and method for accurately measuring the density of materials with rough surfaces by radiation backscatter

  • US 4,701,868 A
  • Filed: 12/13/1984
  • Issued: 10/20/1987
  • Est. Priority Date: 12/13/1984
  • Status: Expired due to Term
First Claim
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1. A method of measuring the density of a material having a rough upper surface by means of radiation backscatter, said method comprisingpositioning on the rough upper surface of the material a block of known density and thickness,directing gamma radiation from a source into the block and into the underlying material,obtaining from at least two geometrically differing source-to-detector relationships separate and distinct measurements of radiation scattered from the block and from the underlying material,calculating from said separate and distinct radiation measurements the density of an upper zone of predetermined thickness greater than the thickness of the block and which includes the thickness of the block as well as that portion of the underlying material which forms said rough upper surface,also calculating from at least one of said radiation measurements the composite density of the block and the underlying material, andcalculating from said composite density and from said upper zone density the density of the material as it exists below said rough upper surface thereof whereby the density value which is obtained is unaffected by the roughness of the surface of the material.

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