Single beam photoneutron probe and X-ray imaging system for cont

Details Single beam photoneutron probe and X-ray imaging system for cont Single beam photoneutron probe and X-ray imaging system for cont

1997-06-05

1998-11-17

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Absorption

378 62, G01N 2304

Patent

active

058387595

ABSTRACT:
An inspection system for detecting contraband in cargo containers, vehicles, rail cars, etc. having an X-ray source and X-ray imaging capability. A cargo container or vehicle is scanned with the beam to look for possible target objects, such as contraband. If the X-ray image shows the existence of targets or possible targets at specific sites, each site may be probed with neutrons by placing a beam converter plate in front of the same X-ray beam used for X-ray imaging, converting the beam to a neutron beam. The neutrons are quickly thermalized and captured by materials producing nuclear reactions with specific elements, yielding gamma rays whose energy is characteristic of particular specific elements. For special nuclear materials, the neutron probe beam can induce the emission of fission neutrons which can be detected. Disclosed are embodiments where the cargo container is fixed and the X-ray equipment is mobile and where the cargo container is mobile and the X-ray equipment is fixed.

REFERENCES:
patent: 5098640 (1992-03-01), Gozani et al.
patent: 5638420 (1997-06-01), Armistead
J. L. Jones et al., "Pulsed photon interrogation with neutron-induced gamma-ray spectrometry for cargo inspections", Proc. SPIE, vol. 2276 Cargo Inspection Technologies, pp. 326-338 (1994).

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