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Method and device for carrying out detection of at least one non-visible object containing a given material

  • US 5,805,660 A
  • Filed: 07/16/1996
  • Issued: 09/08/1998
  • Est. Priority Date: 07/30/1993
  • Status: Expired due to Term
First Claim
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1. A method for detecting the presence of at least one specific material contained in an object, said material evincing a characteristic photo-ionization threshold, wherein:

  • the object is irradiated by a collimated x-ray beam within an energy range containing said photo-ionization threshold,the transmitted beam having passed through said object is detected,characterized in thata continuous function representing the x-ray attenuation or transmission in terms of energy is determined,a search is made for the existence of a characteristic inflection point on the curve representing said continuous function of attenuation or transmission in the vicinity of the energy corresponding to said photo-ionization threshold of said material.

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