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Device for detecting nitrogenous, phosphoric, chloric and oxygenous substances

  • US 5,175,756 A
  • Filed: 11/14/1991
  • Issued: 12/29/1992
  • Est. Priority Date: 11/16/1990
  • Status: Expired due to Fees
First Claim
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1. Apparatus for detecting nitrogenous, phosphoric, chloric and oxygenous substances contained in an object, said apparatus comprising:

  • nuclear activating means (1, 1.1, 3,

         5) for causing at least one of said nitrogenous, phosphoric, chloric or oxygenous substances to emit positron radiation by exposing said object to radiation at a first energy level;

    activity measuring means (8) for recording positron-electron annihilation radiation generated within said object;

    means for determining a first activity density distribution within said object on the basis of coincidence measurements made by said activity measuring means within said object at said first energy level;

    X-ray means (7) for detecting projections created by absorption of radiation within said object, said X-ray means having means for detecting at least two different energy levels of X-rays;

    means (11) for determining a three dimensional absorption density distribution, comprising at least two absorption values for each of a multiplicity of points within said object, based on said projections detected by said X-ray means at each of said at least two different energy levels of X-rays;

    means (11) for comparing said at least two absorption values at respective points within said object and for discriminating at least two atomic number ranges for substances at points within said object to determine an atomic number and absorption density distribution within said object; and

    means (11) for correlating said activity density distribution and said atomic number and absorption density distribution and for constructing a corrected three dimensional activity density distribution within said object.

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