Radiation scanning of cargo conveyances at seaports and the like

• US 7,317,782 B2
• Filed: 01/31/2003
• Issued: 01/08/2008
• Est. Priority Date: 01/31/2003
• Status: Expired due to Fees

• Current Assignee: Varex Imaging Corporation
• Original Assignee: Varian Medical Systems Incorporated (Siemens AG)
• Inventors: Bjorkholm, Paul
• Primary Examiner(s): Church; Craig E.
• Application Number:
  US10/356,101
• Publication Number:
  US 20040156477A1
• Time in Patent Office: 1,803 Days
• Field of Search: 378/57, 378/58, 378/62, 378193-198
• US Class Current: 378/57
• CPC Class Codes: G01N 23/04 and forming images of the material
• CPC Class Codes: G01V 5/226 using tomography
• CPC Class Codes: G21K 5/10 with provision for relative movement of beam source and object to be irradiated

Abstract

A radiation scanning system comprises a radiation source and a radiation detector that are proximate a crane system that moves objects between the source and the detector for scanning. The source and/or detector may be supported by the crane system or may be near to the crane system. Preferably, the source and detector are supported by the crane system or they are within a profile defined by the crane system. The radiation scanning system is particularly suited to scan cargo conveyances, such as sea cargo conveyances, as they are being removed from or loaded onto a ship. Methods of examining objects are disclosed, as well.

Claims

1. A radiation scanning system for scanning objects comprising:

a crane system to move an object from a first location to a second location, the object having a vertical height and a horizontal length greater than the vertical height;

a radiation source proximate the crane system, configured to emit a horizontally diverging radiation beam having a width at a face of the object at least as long as the horizontal length of the object to irradiate the object; and

a radiation detector proximate the crane system, positioned to receive radiation interacting with the object when the object is between the source and the detector;

wherein the source and detector are positioned such that the object is movable vertically between the source and the detector by the crane system.

2. The radiation scanning system of claim 1, wherein the source is adapted to emit a fan beam.

3. The radiation scanning system in claim 1, wherein the radiation source is a source of X-ray radiation.

4. The radiation scanning system of claim 3, wherein the radiation source is adapted to emit a radiation beam having a peak energy of at least about 1 MeV.

5. The radiation scanning system of claim 4, wherein the radiation source is adapted to emit a radiation beam having a peak energy of at least about 6 MeV.

6. The radiation scanning system in claim 3, wherein the X-ray source is a linear accelerator.

7. The radiation scanning system of claim 1, wherein the detector and the source are aligned.

8. The radiation scanning system of claim 1, wherein at least one of the source or the detector are supported by the ground.

9. The radiation scanning system of claim 8, wherein the source and the detector are within a profile defined by the crane system.

10. The radiation scanning system of claim 8, wherein the ground is a seaport.

11. The radiation scanning system of claim 1, further comprising a guide in a space proximate the source and the detector, to guide the movement of the object between the source and the detector.

12. The radiation scanning system of claim 1, wherein the source comprises:

a vertically oriented accelerator body having a distal end; and

a shielded target at the distal end of the accelerator body, to emit a radiation beam towards the detector.

13. The radiation scanning system, claim 1, comprising:

a plurality of sources proximate the crane system, each source adapted to emit a radiation beam upon a portion of an object between the source and the detector.

14. The radiation scanning system of claim 1, wherein the source and the detector are separated by a distance to scan a sea cargo conveyance.

15. The radiation scanning system of claim 1, wherein the crane system comprises:

at least one vertical support;

at least one horizontal support supported by the vertical support;

a conveying system coupled to the horizontal support, to lift an object from a first location, move the object horizontally and lower the object to a second, different location.

16. The radiation scanning system of claim 1, further comprising:

at least one rail;

wherein at least one of the source or the detector are movably supported on the rail.

17. The radiation scanning system of claim 8, wherein:

the at least one of the source or the detector is supported directly by the ground, independent of the crane system.

18. A radiation scanning system for scanning cargo conveyances, the system comprising:

a crane system to move a cargo conveyance from a first location to a second location, the cargo conveyance having a horizontal length of at least 20 feet;

a radiation source supported by the crane system; and

a radiation detector supported by the crane system, positioned to receive radiation interacting with the cargo conveyance when the cargo conveyance is between the source and the detector;

wherein;

the source and the detector are positioned such that the cargo conveyance is moved vertically between the source and the detector by the crane system during scanning; and

the radiation source is configured to emit a horizontally diverging radiation beam having a width at a face of the cargo conveyance at least as long as the horizontal length of the cargo conveyance to irradiate the cargo conveyance.

19. The radiation scanning system of claim 18, wherein the source comprises:

a vertically oriented accelerator body to accelerate an electron beam, the accelerator body having a distal end; and

a shielded target at the distal end of the accelerator body, to emit a radiation beam towards the detector.

20. The radiation scanning system of claim 18, wherein the shielded target comprises:

a tube extending from the accelerator body to receive an electron beam accelerated by the accelerator body; and

a target material in the tube, to generate radiation upon impact by the electron beam; and

shielding material around the target, wherein the shielding material collimates the generated radiation into the horizontally diverging beam.

21. The radiation scanning system of claim 18, wherein the crane system comprises:

at least one vertical support;

at least one horizontal support supported by the vertical support;

a conveying system coupled to the horizontal support, to lift an cargo conveyance from a first location and lower the cargo conveyance to a second, different location.

22. The radiation scanning system of claim 20, wherein the conveying system is adapted to convey the cargo conveyance along a horizontal axis.

23. The radiation scanning system of claim 18, comprising:

a plurality of sources supported by the crane system, each source being adapted to emit a radiation beam upon a portion of the cargo conveyance.

24. The radiation scanning system of claim 18, wherein the radiation source is configured to emit a horizontally diverging radiation beam having a peak energy of at least 1 MeV.

25. A radiation scanning system comprising:

moving means for lifting a cargo conveyance from one location and lowering the cargo conveyance to a second location, the cargo conveyance having a horizontal length greater than a vertical height;

radiation generating means for generating a horizontally diverging radiation beam having a width at a face of the object at least as long as the horizontal length of the cargo conveyance; and

detecting means for detecting radiation interacting with the cargo conveyance;

wherein the moving means moves the cargo conveyance vertically between the generating means and the detecting means.

26. The radiation scanning system of claim 25, wherein:

the generating means generates a horizontally diverging radiation beam to irradiate the object while the moving means the object vertically.

27. A method of examining contents of an object, comprising:

moving an object along a first vertical axis, the object having a horizontal length greater than a vertical height;

moving the object along a second vertical axis different than the first vertical axis, through a horizontally diverging radiation beam having a width at a face of the object at least as long as the horizontal length; and

detecting radiation interacting with the object.

28. The method of claim 27, comprising:

lifting the object from a first location along the first vertical axis; and

lowering the object along the second vertical axis, through the radiation beam, to a second location.

29. The method of claim 28, wherein the object is a cargo conveyance, the first location is on a ship and the second location is on a seaport, the method comprising:

lifting the cargo conveyance from the ship; and

lowering the object through a radiation beam onto the seaport.

30. The method of claim 27, comprising:

lifting the object from a first location along the first vertical axis, through the radiation beam; and

lowering the object along the second vertical axis, to the second location.

31. The method of claim 30, wherein the object is a cargo conveyance, the first location is on a seaport and the second location is on a ship, the method comprising:

lifting the cargo conveyance from the seaport, through the radiation beam; and

lowering the cargo conveyance onto the ship.

32. The method of claim 27, comprising moving the object through a fan beam of radiation.

33. The method of claim 27, comprising moving the object through a cone beam of radiation.

34. The method of claim 27, comprising moving the object by a crane system.

35. The method of claim 27, further comprising:

moving at least one of a source of the horizontally diverging beam or a detector to detect radiation interacting with the object, into a position for operation.

36. A method of examining contents of a cargo conveyance, comprising:

moving a cargo conveyance having a horizontal length of at least about 20 feet by a crane system from a first location to a second location;

moving the cargo conveyance through a horizontally diverging radiation beam having a width at a face of the cargo conveyance at least as wide as the horizontal length of the cargo conveyance while moving the cargo conveyance at least part of the way from the first location to the second location; and

detecting radiation from an interaction of the cargo conveyance with the radiation beam.

37. The method of claim 36, comprising:

lifting the cargo conveyance by the crane system, from a first location;

lowering the cargo conveyance by the crane system, to a second location; and

scanning the cargo conveyance while lowering the cargo conveyance.

38. The method in claim 36, comprising:

lifting the cargo conveyance from a ship; and

lowering the cargo conveyance onto a seaport.

39. The method of claim 36, comprising:

lifting the cargo conveyance by the crane system, from a first location;

scanning the cargo conveyance while lifting the cargo conveyance; and

lowering the cargo conveyance by the crane system, to a second location.

40. The method of claim 39, comprising:

lifting the cargo conveyance from a seaport; and

lowering the cargo conveyance onto a ship.

41. The method of claim 36, further comprising:

moving the cargo conveyance horizontally between moving the cargo conveyance from the first location and moving the cargo conveyance to the second location.

42. The method of claim 41, comprising:

moving the cargo conveyance horizontally through the radiation beam.

43. The method of claim 36, further comprising:

moving at least one of a source of the radiation beam or a detector to detect radiation into position with respect to the crane system.

44. The method of claim 43, comprising:

moving at least one of a source of the radiation beam or a detector to detect radiation into position with respect to the crane system, along a respective rail.

45. A seaport comprising:

a plurality of docking stations;

a plurality of crane systems, each crane system being positioned at a respective docking station;

at least one rail through each docking station;

a radiation source; and

a radiation detector positioned to detect radiation emitted by the source and interacting with an object under examination;

wherein at least one of the source or the detector are movably supported on the rail, to move from one docking station to another.

46. The seaport of claim 45, wherein:

the source is adapted to generate a diverging radiation beam to irradiate the object.

47. The seaport of claim 46, wherein:

the source is adapted to generate a horizontally diverging radiation beam to irradiate the object.

48. The seaport of claim 45, further comprising:

at least one support movably supported on the at least one rail, to support the source and the detector.

49. The seaport of claim 48, comprising:

a first support movably supported on the at least one rail to support the source; and

a second support movably supported on the at least one rail to support the detector.

50. The seaport of claim 49, comprising:

at least two parallel rails, one to support the first support and the other to support the second support.

51. The seaport of claim 45, wherein the at least one rail extends through respective profiles of each crane system.

52. The method of claim 47, comprising:

generating the horizontally diverging radiation beam having a peak energy of at least 1 MeV.

53. A method of operating a seaport, comprising:

docking a first ship at a first docking station at a seaport;

moving a first object between the first ship and the seaport by a first crane at the first docking station;

scanning the first object by an X-ray system positioned at the first docking station;

docking a second ship at a second docking station at the seaport;

moving the X-ray system from the first docking station to the second docking station;

moving a second object between the second ship and the seaport by a second crane at the second docking station; and

scanning the second object by the X-ray station positioned at the second docking station.

54. The method of claim 53, comprising:

moving the X-ray system from the first docking station to the second docking station, along a rail.

55. The method of claim 53, comprising:

scanning first and second objects by respective diverging radiation beams.

56. The method of claim 55, comprising:

moving the first object vertically by the first cranes;

scanning the first object by a first horizontally diverging radiation beam while moving the first object;

moving the second object vertically by the second crane; and

scanning the second object by a second horizontally diverging radiation beam while moving the second object.

57. The method of claim 56, comprising:

moving the first object between a first truck on the seaport at the first docking station; and

moving the second object between a second truck at the seaport at the second docking station.

58. A radiation scanning system for scanning objects, comprising:

a crane system to move an object from a first location to a second location;

a radiation source proximate the crane system; and

a radiation detector proximate the crane system;

wherein;

the crane system moves the object between the radiation source and the radiation detector, during scanning; and

the source comprises;

a vertically oriented accelerator body having a distal end;

a target at the distal end of the accelerator body; and

shielding around the target, the shielding defining a slot therethrough, configured to emit a diverging radiation beam transverse to the vertically oriented accelerator body, towards the detector.

59. The radiation system of claim 58, wherein the slot is configured to define a horizontally diverging radiation beam.

60. The radiation scanning system of claim 58, wherein;

the object is a cargo conveyance having a horizontal length greater than a vertical height;

the source comprises a vertically oriented linear accelerator configured to generate radiation of at least 1 MeV; and

the slot is configured to define the diverging radiation beam with a width at a face of the cargo conveyance at least as wide as the horizontal length of the cargo conveyance.

61. The radiation scanning system of claim 60, wherein the cargo conveyance has a horizontal length of at least about 20 feet.

62. The radiation scanning system of claim 61, wherein the horizontal length is at least about 40 feet.

63. The radiation scanning system of claim 60, wherein the slot is configured to define a horizontally diverging radiation beam diverging over an angle of at least 30 degrees.

64. The radiation scanning system of claim 63, wherein the detector comprises:

a first detecting section facing the source; and

second and third detecting sections transverse to the first section.

65. The radiation scanning system of claim 64, wherein:

the first detecting section is straight; and

the second and third detecting sections are perpendicular to the first detecting section.

66. A radiation scanning system for scanning objects, comprising:

a crane system to move an object from a first location to a second location;

a radiation detector proximate the crane system; and

a plurality of radiation sources proximate the crane system, at least some of the radiation sources being adapted to emit a radiation beam only upon a respective portion of an object moved between the source and the detector by the crane system, to irradiate the entire object;

wherein the detector is positioned to detect radiation interacting with the object.

67. The system of claim 66, wherein:

the object is a rectangular container having a longitudinal face;

the crane system is adapted to move the container vertically, between the source and the detector, and through the radiation beams; and

the plurality of sources are positioned such that the entire longitudinal face of the container is irradiated while the container is moved vertically between the plurality of sources and the detector.

68. The radiation scanning system of claim 67, wherein:

the at least some of the radiation sources are configured to emit respective horizontally diverging radiation beams; and

the respective portions of the object partially overlap.

69. The radiation scanning system of claim 67, wherein the rectangular container is a cargo conveyance having a horizontal length of at least about 20 feet.

70. The method of claim 69, wherein the cargo conveyance has a horizontal length of at least about 40 feet.

71. A radiation scanning system for scanning objects, comprising:

a crane system supported by ground to move an object from a first location to a second location;

a radiation source proximate the crane system, to emit a radiation beam toward the object;

a radiation detector proximate the crane system; and

at least one rail, supported on the ground proximate the crane system;

wherein;

at least one of the source or the detector are movably supported by the rail such that the object may be moved between the source and the detector by the crane system.

72. A radiation scanning system for scanning objects, comprising:

a crane system comprising;

a boom arm lying in a plane, to move an object between a first location and a second location;

forward vertical supports to support the boom arm, the forward vertical supports being connected by at least one first crossbeam extending along a first axis substantially perpendicular to the plane; and

rearward vertical supports to support the boom arm, the rearward vertical supports being connected by at least one second crossbeam extending along a second axis substantially perpendicular to the plane;

a radiation source supported by one of the first or second crossbeams;

a radiation detector supported by another of the first or second crossbeams;

wherein;

the boom arm extends forward of the forward vertical support, to access the first location;

the second location is between the forward vertical supports and the rearward vertical supports; and

the boom arm moves the object vertically, between the radiation source and the radiation detector, during scanning.