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Spectrally shaped X-ray inspection system

An inspection system and spectrum technology, applied in the field of X-ray inspection systems with spectral shaping, can solve the problems of no design, no effective control of X-ray intensity, etc., and achieve the effect of cost reduction

Inactive Publication Date: 2006-08-09
AMERICAN SCI & ENG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ambient radiation, as defined above, is not described in any of the absorber examples in use today, neither as a design consideration nor as an effective control for controlling x-ray intensity

Method used

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Examples

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Embodiment Construction

[0022] A system for advantageously reducing environmental radiation exposure while providing the advantage of a highly penetrating x-ray beam is described below. A common theme of the various embodiments to be described below is the alternation of a low intensity, predominantly low energy x-ray spectrum with a low intensity, predominantly high energy spectrum.

[0023] refer to figure 1 , shows the x-ray spectrum emitted at 90° from a tungsten target bombarded with electrons at 3 MeV. The solid line, indicated by numeral 6, corresponds to the first x-ray spectrum produced by Monte Carlo simulation under specified conditions. The unfiltered first spectrum 6 is displayed on a logarithmic scale as a function of photon energy in MeV. (Although the solid line 6 is called "unfiltered" here, it is actually lightly filtered to reduce the intensity of x-rays below about 200 keV.) In the unfiltered first spectrum 6, about 50% of X-rays have energies below 500keV, and only 8% of x-ray...

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Abstract

A system and methods for non-invasive x-ray inspection of an enclosure in such a manner as to reduce the ambient radiation dose to below a specified level. A beam spectrally filtered to emphasize a high-energy component of penetrating radiation is interleaved, temporally, with a beam dominated by a low-energy component. Thus both lightly loaded and heavily loaded cargo may be inspected while limiting the ambient scattered radiation.

Description

technical field [0001] The present invention relates to systems and methods for inspecting objects, particularly cargo in containers, trucks and trains, using spectrally filtered penetrating radiation. Background technique [0002] X-ray inspection of containers is used for many purposes, including checking for contraband, stolen goods and verifying shipments across national borders. [0003] Such inspection systems typically generate so-called transmission images by detecting the intensity distribution of x-rays passing through the container. The contents of lightly loaded containers can be effectively inspected with x-ray energies in the hundreds of keV range, but heavy-duty semi-trailers, tank trucks, trains, and ISO containers typically require x-rays in the MeV range. The design of x-ray inspection systems for inspection of inhomogeneous cargo requires simultaneous consideration of the conflicting requirements for penetration, sensitivity, and radiation dose, for which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V5/00G01N23/02G01N23/20
CPCG01N23/20G01N23/02G01V5/0041G01V5/224
Inventor 李·格罗津斯彼得·罗斯柴尔德
Owner AMERICAN SCI & ENG INC