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Nuclear radiation apparatus and method for dynamically measuring density of test materials during compaction

  • US 4,979,197 A
  • Filed: 02/17/1989
  • Issued: 12/18/1990
  • Est. Priority Date: 05/22/1986
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the density of a test material using a nuclear radiation backscatter gauge including nuclear radiation source and nuclear radiation detector means positioned in spaced relation to the source, said method comprisingmoving the source and detector means relative to the test material while maintaining the source and detector means in spaced relation above the surface of the test material to form an air gap therebetween,obtaining a count of the photons which are backscattered to the detector means by the test material,obtaining a measurement which represents the size of the air gap between the surface of the test material and the detector means by ultrasonically measuring the air gap while compensating for variations in the speed of sound due to changes in air temperature in the measuring region, andcalculating the density of the test material as a function of said count of backscattered photons and said measurement of the air gap.

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