US20010033636A1 - Method and apparatus for determining a material of a detected item - Google Patents

Method and apparatus for determining a material of a detected item Download PDF

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Publication number
US20010033636A1
US20010033636A1 US09/760,418 US76041801A US2001033636A1 US 20010033636 A1 US20010033636 A1 US 20010033636A1 US 76041801 A US76041801 A US 76041801A US 2001033636 A1 US2001033636 A1 US 2001033636A1
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Prior art keywords
ray
collimator
detector
diffraction
average atomic
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Abandoned
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US09/760,418
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English (en)
Inventor
Martin Hartick
Frank Cordes
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Individual
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Individual
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Priority to US09/760,418 priority Critical patent/US20010033636A1/en
Publication of US20010033636A1 publication Critical patent/US20010033636A1/en
Priority to US10/046,777 priority patent/US6532276B1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
    • G01V5/222—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays measuring scattered radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
    • G01V5/224—Multiple energy techniques using one type of radiation, e.g. X-rays of different energies
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K5/00—Irradiation devices
    • G21K5/04—Irradiation devices with beam-forming means

Definitions

  • the invention relates to a method wherein the material is X-rayed by a primary beam that is diffracted at the material and an apparatus for determining the material of a detected item in an object.
  • a useful technique for checking for explosives is X-ray diffraction, in which X-ray irradiation scattered at the crystal structure of an item is measured and compared to the characteristic energy spectra of different explosives, for example.
  • the measured energies can provide an indication of the presence of an explosive, and can thereby provide information about the presence and nature of an explosive material in the object.
  • Apparatuses and methods that operate according to this principle are known from, for example, DE 195 10 168 A1, EP 0 354 045 A2 and U.S. Pat. No. 4,956,856.
  • a drawback of these methods is that absorption of the X-ray irradiation by, for example, the object and item affects the X-ray diffraction spectrum. Consequently, if spectral information is missing due to absorption, inaccurate conclusions may be drawn regarding the type of material and the identification of the substances examined.
  • the above object generally is achieved according to the first aspect of the invention by a method for determining the material of a detected item in an object that comprises the steps of irradiating the material with a primary X-ray beam; measuring a diffraction spectrum of the material, with the spectrum comprising X-rays of the primary beam diffracted from the material; measuring the X-ray absorption of the material and an average atomic number of the material by measuring X-rays of the primary beam transmitted through the material; and comparing the measured diffraction spectrum and measured average atomic number of the material to known diffraction spectra and known average atomic numbers of known materials to determine the material.
  • the apparatus for determining the material of a detected item in an object comprises a diffraction apparatus and a computer connected thereto, wherein the diffraction apparatus comprises an X-ray source and a collimator/detector arrangement, including a detector located behind a collimator, with the detector comprising an X-ray sensitive surface oriented toward the collimator.
  • the collimator defines a central, blind-bore opening and at least one conically expanding slot, with the at least one conically expanding slot simulating a predetermined angle and being oriented toward the X-ray sensitive surface of the detector.
  • the central opening is closed to the detector and has first and second detection devices mounted therein, with the first and second detection devices being connected to the computer detecting relatively lower and relatively higher energy X-rays, respectively, and being spaced in the central opening with the second detection device located behind the first detection device.
  • the concept underlying the invention is to obtain additional information about the absorption behavior of the materials from the central X-ray beam during a diffraction measurement, and to make this information available along with the diffraction spectrum for evaluation and identification of the material.
  • the diffraction apparatus which as indicated above, generally comprises a collimator/detector arrangement and an X-ray source for generating a central beam or primary beam that is aimed at the arrangement.
  • collimator of the collimator/detector arrangement has a central, blind-bore open to and facing the X-ray source, in which first and second detector devices are arranged, with the first and second detector devices being spatially separate from each other and disposed one behind the other.
  • the detector device that is impacted first by the primary beam is designed as a detector for relatively lower X-ray energies, and the device impacted second is designed as a detector for relatively higher X-ray energies.
  • an average atomic number (ordinal number) of the material of the item located in the primary beam is additionally determined.
  • the diffraction apparatus is preferably adjustably mounted in an X-ray testing machine, with the collimator/detector arrangement being adjustable in height relative to the X-ray source.
  • the collimator/detector arrangement further comprises a circular-slot collimator having an energy-sensitive detector behind it.
  • FIG. 1 is a schematic representation of an embodiment of the invention in an X-ray testing machine.
  • FIG. 2 further illustrates the apparatus of the invention of FIG. 1 in more detail.
  • an object 1 to be X-rayed is located in an X-ray tunnel 2 of an X-ray testing machine 3 .
  • a diffraction apparatus 4 comprising a collimator/detector arrangement 5 and an X-ray source 6 .
  • the collimator/detector arrangement is directed at a primary beam FX′, a “pencil beam,” of an X-ray bundle of this X-ray source 6 , which, in this embodiment, is preferably disposed beneath a transport device 7 for an object to be transported in the X-ray tunnel 2 .
  • the collimator/detector arrangement 5 preferably can be adjusted in height relative to the X-ray source 6 .
  • FIG. 2 shows parts of the diffraction apparatus 4 in greater detail.
  • the collimator 8 possesses a circular slot 10 in the form of a conical jacket such that, of the scatter radiation emanating from the tested point of the object, only the components that fall within a specific angle ⁇ M are allowed through.
  • the energy-sensitive surface 9 . 1 of a detector 9 located behind the collimator 8 thus detects the scatter radiation FX′′ at the scatter angle ⁇ M .
  • a screen arrangement 11 for example an aperture-plate arrangement, is mounted in front of the X-ray source 6 .
  • the primary beam FX′ impacts a material
  • this primary beam FX′ is known to be partially deflected at the crystal-lattice structure of the material (Bragg's Law) as scatter radiation FX′′.
  • the energy spectrum obtained with the energy-sensitive detector 9 reveals the crystal structure of the material, and thus the identity of the material.
  • explosives can be identified and distinguished in this manner.
  • the material in a first step, is X-rayed by the primary beam FX′, and in a second step, the primary beam FX′ is diffracted at the material, thereby producing a diffraction spectrum, which is measured with the detector 9 in a third step.
  • this measured energy spectrum or diffraction spectrum is compared to known diffraction spectra that are stored in the computer 16 for determining the type of material.
  • the measured diffraction spectrum is influenced by the absorption behavior of the material located in the beam path of the primary beam FX′.
  • a central, bore-like opening 12 acting as a central, collimator is cut into the collimator 8 , the opening being closed against the detector 9 disposed behind it, i.e., a blind bore.
  • Disposed in the opening 12 are a first detection device 13 and, behind it at a defined distance, a second detection device 14 .
  • the first detection device 13 is designed as a detector for relatively lower X-ray energies
  • the second detection device 14 is designed as a detector for relatively higher X-ray energies.
  • These detection devices 13 , 14 can be used in a conventional manner to measure the absorption behavior of the material and, from this, to determine in a computer 16 the average atomic number of the material according to, for example, a multi-energy measurement method.
  • a computer 16 In the presence of a highly-absorbent material, lower-energy diffraction lines disappear in the diffraction spectrum of the material to be determined, so the corresponding diffraction lines are missing in the measured energy spectrum or diffraction spectrum.
  • This information can be supplied to the computer 16 , which then classifies these as missing, for example, and therefore as diffraction lines that are not to be tested in the evaluation of the energy spectra. In this way, an improved identification of the material is attained with the combination of the average atomic number and the determined energy spectrum or diffraction spectrum.
  • the collimator/detector arrangement 5 and the X-ray source 6 are mounted to be adjusted in the X-ray testing machine 3 , and are preferably guided synchronously for determining the material of an item. This is effected, for example, by way of linear guides having a spindle drive, not shown, which are actuated centrally by the computer 16 .
  • the detection devices can also be used in other diffraction apparatuses whose primary beam is configured differently, in which case the detectors 13 and 14 must accordingly be directed at the primary beam.

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • General Engineering & Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
US09/760,418 1999-11-13 2001-01-16 Method and apparatus for determining a material of a detected item Abandoned US20010033636A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09/760,418 US20010033636A1 (en) 1999-11-13 2001-01-16 Method and apparatus for determining a material of a detected item
US10/046,777 US6532276B1 (en) 1999-11-13 2002-01-17 Method and apparatus for determining a material of a detected item

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19954663A DE19954663B4 (de) 1999-11-13 1999-11-13 Verfahren und Vorrichtung zur Bestimmung eines Materials eines detektierten Gegenstandes
DE19954663.0 1999-11-13
US64548500A 2000-08-25 2000-08-25
US09/760,418 US20010033636A1 (en) 1999-11-13 2001-01-16 Method and apparatus for determining a material of a detected item

Related Parent Applications (1)

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US64548500A Continuation 1999-11-13 2000-08-25

Related Child Applications (1)

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US10/046,777 Continuation US6532276B1 (en) 1999-11-13 2002-01-17 Method and apparatus for determining a material of a detected item

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US20010033636A1 true US20010033636A1 (en) 2001-10-25

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US09/759,643 Expired - Lifetime US6483894B2 (en) 1999-11-13 2001-01-16 Apparatus and method for adjusting a collimator
US09/760,418 Abandoned US20010033636A1 (en) 1999-11-13 2001-01-16 Method and apparatus for determining a material of a detected item
US10/046,777 Expired - Lifetime US6532276B1 (en) 1999-11-13 2002-01-17 Method and apparatus for determining a material of a detected item

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US09/759,643 Expired - Lifetime US6483894B2 (en) 1999-11-13 2001-01-16 Apparatus and method for adjusting a collimator

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US10/046,777 Expired - Lifetime US6532276B1 (en) 1999-11-13 2002-01-17 Method and apparatus for determining a material of a detected item

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US (3) US6483894B2 (fr)
DE (1) DE19954663B4 (fr)
FR (1) FR2801103B1 (fr)
GB (1) GB2359719B (fr)
NL (1) NL1016471C2 (fr)

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FR2801103A1 (fr) 2001-05-18
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NL1016471A1 (nl) 2001-05-15
GB0027195D0 (en) 2000-12-27
US6532276B1 (en) 2003-03-11
GB2359719A (en) 2001-08-29
US6483894B2 (en) 2002-11-19
DE19954663A1 (de) 2001-06-07
FR2801103B1 (fr) 2005-08-12
US20010036250A1 (en) 2001-11-01
GB2359719B (en) 2003-12-31

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