Method and device for carrying out detection of at least one...

G - Physics – 01 – V

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G01V 5/12 (2006.01) G01V 5/00 (2006.01)

Patent

CA 2166985

The method consists in irradiating the object using a collimated X-ray beam (21) corresponding to an energy spectrum having a photoionization threshold and detecting the transmitted beam after it has passed through said object (24). The method is also characterized in that a continuous function, representing the X-ray attenuation or transmission as a function of the energy, is determined, and the existence of an inflection point characteristic of said material is checked for on the curve representing said continuous attenuation or transmission function, in the vicinity of the energy level corresponding to the photoionization threshold. Application, for example, to airport baggage inspection.

La présente invention se rapporte à un procédé et à un dispositif pour sa mise en oeuvre, destinés à détecter su moins un objet comportant un matériau donné, et non accessible à la vue. Le procédé, qui comprend les étapes consistant en ce que: on irradie l'objet par un faisceau collimaté de rayons X (21) correspondant à une plage d'énergie contenant un seuil de photoionisation; on détecte le faisceau transmis après passage au travers dudit objet (24); est caractérisé en ce qu'en outre: on détermine une fonction continue représentative de l'atténuation ou de la transmission des rayons X en fonction de l'énergie; et on recherche sur 1a courbe représentant ladite fonction continue représentative de l'atténuation ou de la transmission, au voisinage de l'énergie correspondant audit seuil de photoionisation, l'existence d'un point d'inflexion, caractéristique de la présence dudit matériau. Cette invention s'applique, par exemple, aux inspections de bagages dans les aéroports.

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