Title:
【発明の名称】直接画像形成用のパルス化形高速中性子を用いた禁輸品検出システムおよび方法
Document Type and Number:
Japanese Patent JP3144642
Kind Code:
B2
Abstract:
A system and method for detecting contraband generates a highly collimated beam of pulsed fast neutrons, having a pulse width on the order of a nanosecond, and an energy of 5 to 9 MeV. An object under investigation is scanned with the collimated pulsed beam. The neutrons in the beam cause (n, gamma ) reactions in a limited object volume or voxel, defined by the intersection of the collimated beam and the scanned object. The highly penetrating fast neutrons produce nuclear reactions with the atomic elements present within the object, causing gamma rays to be emitted. By measuring the approximate time of flight of the neutron pulse, a determination is made as to the particular voxel from which the gamma ray originated. The energy of the detected gamma rays identifies the particular elements from which the gamma rays originated. Thus, e.g., the carbon, nitrogen, oxygen, and chlorine content, which elements are commonly found in contraband, of a particular voxel can be determined directly and precisely. This voxel content information may be combined from a substantial sample of the voxels that make up the object to provide a direct indication of the elemental content of the object, and hence whether contraband is present or absent within the object.
Inventors:
Sawa, Zie Peter
Gozani, Tsai
Rigi, Peter
Gozani, Tsai
Rigi, Peter
Application Number:
JP50710791A
Publication Date:
March 12, 2001
Filing Date:
January 09, 1991
Export Citation:
Assignee:
Science Applications International Corporation
International Classes:
G01N23/222; G01V5/00; G21H5/00; (IPC1-7): G01N23/222
Domestic Patent References:
| JP6446633A | ||||
| JP5611899B2 | ||||
| JP5505675A | ||||
| JP4504310A |
Other References:
【文献】国際公開90/16072(WO,A1)
【文献】米国特許4851687(US,A)
【文献】米国特許4882121(US,A)
【文献】米国特許3146349(US,A)
【文献】米国特許5076993(US,A)
【文献】欧州特許466920(EP,B1)
【文献】米国特許4851687(US,A)
【文献】米国特許4882121(US,A)
【文献】米国特許3146349(US,A)
【文献】米国特許5076993(US,A)
【文献】欧州特許466920(EP,B1)
Attorney, Agent or Firm:
Kazuo Shamoto (4 outside)