System and Method for inspecting an object using spatially and spectrally distinguished beams

Inactive Publication Date: 2002-07-18
AMERICAN SCI & ENG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the high-energy x-ray components of a radiation beam are not as "sensitive" for distinguishing among materials as the low-energy x-ray components of a r

Method used

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  • System and Method for inspecting an object using spatially and spectrally distinguished beams
  • System and Method for inspecting an object using spatially and spectrally distinguished beams
  • System and Method for inspecting an object using spatially and spectrally distinguished beams

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Embodiment Construction

[0023] In accordance with an embodiment of the invention, the energy distribution of an x-ray beam is filtered to simultaneously optimize the penetration of the x-ray beam through a high-density object, as well as the sensitivity of the x-ray beam to a low-density object, while minimizing the ambient radiation dose. The term `x-ray` is used herein to encompass penetrating radiation generally and, for example, gamma rays are within the scope of the invention.

[0024] FIG. 1 is a schematic top view of an exemplary embodiment of an inspection system in accordance with the invention. The system, referenced as system 100, includes generator 110 and collimator 120. Generator 110 generates penetrating radiation and may include, for example, an x-ray tube or a linear accelerator ("LINAC"). The generated x-ray beam typically includes x-ray energies from below approximately 200 keV to above approximately 9 MeV. Collimator 120 forms the generated radiation into a beam 10 of specified cross-secti...

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Abstract

A system and method for inspecting an object, the system and method comprising a source for generating a penetrating radiation beam for irradiating the object, the beam having, for each instant of time, an instantaneous energy spectrum of intensity, a shaper for modulating the generated beam, thereby creating a shaped beam, the shaper comprising at least a first section and a second section, the first section attenuating the intensity of a portion of the generated beam by a first attenuation factor and the second section attenuating the intensity of another portion of the generated beam by a second attenuation factor, and at least one detector for detecting the shaped beam after the shaped beam interacts with the object.

Description

[0001] This application is a combination-in-part of U.S. patent application Ser. No. 09 / 502,093, filed Feb. 10, 2000, entitled SPECTRALLY SHAPED X-RAY INSPECTION SYSTEM and bearing attorney docket number 1945 / A09, the disclosure of which is incorporated herein, in its entirety, by reference.TECHNICAL FIELD AND BACKGROUND ART[0002] The invention relates to systems and methods for inspecting objects and, more particularly, the invention relates to systems and methods for inspecting objects a plurality of radiation beams characterized by distinctive energy spectra.[0003] As discussed in U.S. patent application Ser. No. 09 / 502,093, the design of an x-ray inspection system to examine heterogeneous cargo requires joint consideration of conflicting requirements for penetration, radiation dosage, and sensitivity. For example, the high-energy x-ray components of a radiation beam from a 3 MeV x-ray accelerator penetrate approximately 3 times farther through iron than do the high-energy x-ray ...

Claims

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Application Information

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IPC IPC(8): G01N23/02G01N23/20G01V5/00
CPCG01N23/02G01N23/20G01V5/0041
Inventor GRODZINS, LEE
Owner AMERICAN SCI & ENG INC
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