Title:
【発明の名称】X線を用いた物質の識別における,およびそれに関連する改良
Document Type and Number:
Japanese Patent JPH07505216
Kind Code:
A
Abstract:
PCT No. PCT/GB92/00885 Sec. 371 Date Jun. 13, 1994 Sec. 102(e) Date Jun. 13, 1994 PCT Filed May 15, 1992 PCT Pub. No. WO93/14419 PCT Pub. Date Jul. 22, 1993.A method and apparatus for detecting the mean atomic number of a mass of material, for example freight in a vehicle comprises: subjecting the mass to X-rays and determining the mean number NA passing therethrough; subjecting the mass to higher energy X-rays and determining the new mean number NB; and determining the mean atomic number of the mass from look-up tables against the computed ratio NA/NB. The mass, such as a railway wagon, may be scanned by two linear accelerators arranged perpendicular to each other, detector arrays being disposed respectively opposite the accelerators, so that a three dimensional image can be built up of the mass.
Inventors:
Neil, William Ray
Rushbrook, John Gordon
Anserge, Richard Eric
Rushbrook, John Gordon
Anserge, Richard Eric
Application Number:
JP50925992A
Publication Date:
June 08, 1995
Filing Date:
May 15, 1992
Export Citation:
Assignee:
Cambridge Imaging Limited
International Classes:
G01N23/18; G01N23/04; G01V5/00; (IPC1-7): G01N23/18; G01V5/00
Attorney, Agent or Firm:
Fukami Hisaro (3 outside)