System and method for scanning carriers for objects

• US 20040000999A1
• Filed: 11/08/2002
• Published: 01/01/2004
• Est. Priority Date: 11/08/2001
• Status: Abandoned Application

• Current Assignee: Ranger Security Detectors Inc.
• Original Assignee: Ranger Security Detectors Inc.
• Inventors: Turner, John E., Turner, David F., Turner, Brian J., Gorbet, Charles, Turner, Robert M., Truitt, Mitchell M., Burk, Les R.
• Application Number:
  US10/290,856
• Publication Number:
  US 20040000999A1
• Time in Patent Office: Days
• US Class Current: 340/572.4
• CPC Class Codes: G01T 1/163 Whole body counters hand or feet contamination measurement G01T1/167; lung, brain, thyroid, kidney or the like counting G01T1/16
• CPC Class Codes: G01V 3/10 using induction coils

Abstract

A system and method for scanning carriers for objects include the capability to sense a radioactive object in the detection proximity of a platform and form a signal indicative thereof and to determine whether an illicit radioactive object may be in the detection proximity. The system and method also include the capability to sense a metallic object in the detection proximity of the platform and form a signal indicative thereof and to determine whether an illicit metallic object may be in the detection proximity.

Claims

1. A system for scanning carriers for objects, comprising:

a platform;

a metal detection subsystem coupled to the platform, the metal detection subsystem operable to sense a metallic object in a detection proximity of the platform and to form a signal indicative thereof;

a radiation detection subsystem coupled to the platform, the radiation detection subsystem operable to sense a radioactive object in the detection proximity of the platform and to form a signal indicative thereof; and

a processing subsystem coupled to the metal detection subsystem and the radiation detection subsystem, the processing subsystem operable to determine, based on the signals from the metal detection subsystem and the radiation detection subsystem, if an illicit object may be in the detection proximity of the platform.

2. The system of claim 1, wherein the platform includes a walk-through passage.

3. The system of claim 1, wherein the platform comprises a housing.

4. The system of claim 1, wherein the radiation detection subsystem comprises:

a scentillator operable to sense the presence of a radioactive object and to generate a light signal indicative thereof;

a photomultiplier tube operable to amplify the light signal; and

a photodetector operable to detect the amplified light signal and to generate an electrical signal indicative thereof.

5. The system of claim 1, wherein the scentillator senses gamma rays to sense the presence of a radioactive object.

6. The system of claim 1, wherein:

the radiation detection subsystem comprises a plurality of radiation detectors, each detector corresponding to a different zone of the platform; and

the processing subsystem is operable to determine the zone in which a radioactive object is likely to be located.

7. The system of claim 1, wherein the metal detection subsystem comprises:

a magnetic field generator; and

a magnetic field detector.

8. The system of claim 7, wherein:

the magnetic field generator comprises;

an oscillator, and

a coil of wire coupled to the oscillator, the coil generating a magnetic field when excited by the oscillator; and

the magnetic field detector comprises;

a coil of wire operable to generate an electrical signal if the magnetic field is disturbed, and

a detector circuit coupled to the coil of wire, the detector circuit operable to detect the electrical signal.

9. The system of claim 1, wherein:

the metal detection subsystem comprises a plurality of magnetic field detectors, each detector corresponding to a different zone of the platform; and

the processing subsystem is operable to determine the zone in which a metallic object is likely to be located.

10. The system of claim 1, further comprising a presence subsystem coupled to the processing subsystem, the presence subsystem operable to determine when a carrier is in the detection proximity of the platform.

11. The system of claim 10, wherein the processing subsystem is operable to:

perform background radiation calculations when the presence subsystem does not detect a carrier in the detection proximity of the platform; and

perform radioactive object detection calculations when the presence subsystem detects a carrier in the detection proximity of the platform.

12. The system of claim 10, wherein the processing subsystem continues to perform metallic object detection calculations when the presence subsystem does not detect a carrier is in the detection proximity of the platform, but does not initiate an alarm if an illicit metallic object may be in the detection proximity of the platform.

13. The system of claim 1, further comprising an alarm subsystem coupled to the processing subsystem, the alarm subsystem operable to generate a user intelligible signal if an illicit object may be in the detection proximity of the platform.

14. The system of claim 13, wherein the alarm subsystem comprises a visual portion operable to alert a user if an illicit object may be in the detection proximity of the platform.

15. The system of claim 14, wherein the visual portion provides an indication of where an illicit object may be located on a carrier.

16. The system of claim 15, wherein the indication is different for metallic objects and radioactive objects.

17. The system of claim 13, wherein the alarm subsystem comprises an acoustic portion operable to alert a user if an illicit object may be in the detection proximity of the platform.

18. The system of claim 17, wherein the acoustic portion outputs a first sound if an illicit metallic object may be present and a second sound if an illicit radioactive object may be present.

19. They system of claim 1, further comprising a second metal detection subsystem coupled to the platform, the second metal detection subsystem operable to scan a portion of a carrier for metallic objects.

20. The system of claim 19, wherein the portion comprises the oral/facial region of a carrier.

21. A method for scanning carriers for objects, comprising:

sensing a radioactive object in the detection proximity of a platform and forming a signal indicative thereof;

determining whether an illicit radioactive object may be in the detection proximity;

sensing a metallic object in the detection proximity of the platform and forming a signal indicative thereof; and

determining whether an illicit metallic object may be in the detection proximity.

22. The method of claim 21, wherein the platform includes a walk-through passage.

23. The method of claim 21, wherein determining whether an illicit radioactive object may be in the detection proximity comprises determining whether the signal exceeds a threshold.

24. The method of claim 23, wherein determining whether the signal exceeds a threshold comprises comparing the radiation in the detection proximity of the platform to the background radiation in the detection proximity of the platform.

25. The method of claim 21, wherein:

sensing a radioactive object in the detection proximity of the platform and forming a signal indicative thereof comprises sensing a radioactive object in a plurality of zones of the platform and forming signals indicative thereof, each signal associated with a different zone of the platform; and

determining whether an illicit radioactive object may be in the detection proximity comprises determining whether any of the signals exceeds a threshold and, if so, determining the zone in which the object is likely to be located.

26. The method of claim 21, wherein:

sensing a metallic object in the detection proximity of the platform and forming a signal indicative thereof comprises sensing a metallic object in a plurality of zones of the platform and forming signals indicative thereof, each signal associated with a different zone of the platform; and

determining whether an illicit metallic object may be in the detection proximity comprises determining whether any of the signals exceed a threshold and, if so, determining the zone in which the object is likely to be located.

27. The method of claim 21, further comprising:

determining whether a carrier is in the detection proximity of the platform; and

performing background radiation calculations if a carrier is not in the detection proximity of the platform.

28. The method of claim 27, further comprising refusing to initiate an alarm for an illicit metallic object if a carrier is not in the detection proximity of the platform.

29. The method of claim 27, further comprising generating a signal to inform a carrier to proceed with scanning if scanning of a carrier is complete.

30. The method of claim 21, further comprising generating a user intelligible signal if an illicit object may be in the detection proximity of the platform.

31. A set of logic for scanning carriers for objects, the logic encoded in a computer readable medium and operable to:

receive a signal indicative of a radioactive object in the detection proximity of a platform;

determine whether an illicit radioactive object may be in the detection proximity;

receive a signal indicative of a metallic object in the detection proximity of the platform; and

determine whether an illicit metallic object may be in the detection proximity.

32. The logic of claim 31, wherein the platform includes a walk-through passage.

33. The logic of claim 31, wherein determining whether an illicit radioactive object may be in the detection proximity comprises determining whether the signal exceeds a threshold.

34. The logic of claim 33, wherein determining whether the signal exceeds a threshold comprises comparing the radiation in the detection proximity of the platform to the background radiation in the detection proximity of the platform.

35. The logic of claim 31, wherein:

receiving a signal indicative of a radioactive object in the detection proximity of a platform comprises receiving a plurality of signals indicative of a radioactive object in the detection proximity of the platform, each signal associated with a different zone of the platform; and

determining whether an illicit radioactive object may be in the detection proximity comprises determining whether any of the signals exceeds a threshold and, if so, determining the zone in which the object is likely to be located.

36. The logic of claim 31, wherein:

receiving a signal indicative of a metallic object in the detection proximity of the platform comprises receiving a plurality of signals indicative of a metallic object in the detection proximity of the platform; and

determining whether an illicit metallic object may be in the detection proximity comprises determining whether any of the signals exceeds a threshold and, if so, determining the zone in which the object is likely to be located.

37. The logic of claim 31, wherein the logic is further operable to:

determine whether a carrier is in the detection proximity of the platform; and

perform background radiation calculations if a carrier is not in the detection proximity of the platform.

38. The logic of claim 37, wherein the logic is further operable to refuse to initiate an alarm for an illicit metallic object if a carrier is not in the detection proximity of the platform.

39. The logic of claim 37, wherein the logic is further operable to instruct a signaling device to generate a signal to inform a carrier to proceed with scanning if scanning of a carrier is complete.

40. The logic of claim 31, wherein the logic is further operable to instruct an alarm subsystem to generate a user intelligible signal if an illicit object may be in the detection proximity of the platform.

41. A system for scanning carriers for objects, comprising:

means for sensing a radioactive object in the detection proximity of a platform and forming a signal indicative thereof;

means for determining whether an illicit radioactive object may be in the detection proximity;

means for sensing a metallic object in the detection proximity of the platform and forming a signal indicative thereof; and

means for determining whether an illicit metallic object may be in the detection proximity.

42. The system of claim 41, wherein the platform includes a walk-through passage.

43. The system of claim 41, wherein determining whether an illicit radioactive object may be in the detection proximity comprises determining whether the signal exceeds a threshold.

44. The system of claim 43, wherein determining whether the signal exceeds a threshold comprises comparing the radiation in the detection proximity of the platform to the background radiation in the detection proximity of the platform.

45. The system of claim 41, wherein:

sensing a radioactive object in the detection proximity of a platform and forming a signal indicative thereof comprises sensing a radioactive object in a plurality of zones of the platform and forming signals indicative thereof, each signal associated with a different zone of the platform; and

determining whether an illicit radioactive object may be in the detection proximity comprises determining whether any of the signals exceeds a threshold and, if so, determining the zone in which the object is likely to be located.

46. The system of claim 41, wherein:

sensing a metallic object in the detection proximity of the platform and forming a signal indicative thereof comprises sensing a metallic object in a plurality of zones of the platform and forming signals indicative thereof, each signal associated with a different zone of the platform; and

determining whether an illicit metallic object may be in the detection proximity comprises determining whether any of the signals exceeds a threshold and, if so, determining the zone in which the object is likely to be located.

47. The system of claim 41, further comprising means for determining whether a carrier is in the detection proximity of the platform, wherein the means for determining whether an illicit radioactive object may be in the detection proximity performs background radiation calculations if a carrier is not in the detection proximity of the platform.

48. The system of claim 47, wherein the means for determining whether an illicit metallic object may be in the detection proximity refuses to initiate an alarm for an illicit metallic object if a carrier is not in the detection proximity of the platform.

49. The system of claim 47, further comprising means for generating a signal to inform a carrier to proceed with scanning if scanning of a carrier is complete.

50. The system of claim 41, further comprising means for generating a user intelligible signal if an illicit object may be in the detection proximity of the platform.

51. A system for scanning carriers for objects, comprising:

a platform including a walk-through passage;

a metal detection subsystem coupled to the platform, the metal detection subsystem operable to sense a metallic object in the passage and to form a signal indicative thereof;

a radiation detection subsystem coupled to the platform, the radiation detection subsystem operable to sense a radioactive object in the passage and to form a signal indicative thereof; and

a processing subsystem coupled to the metal detection subsystem and the radiation detection subsystem, the processing subsystem operable to determine, based on the signals from the metal detection subsystem and the radiation detection subsystem, if an illicit object may be in the passage.

52. The system of claim 51, wherein the platform comprises a housing.

53. The system of claim 51, wherein the radiation detection subsystem comprises:

a scentillator operable to sense the presence of a radioactive object and to generate a light signal indicative thereof;

a photomultiplier tube operable to amplify the light signal; and

a photodetector operable to detect the amplified light signal and to generate an electrical signal indicative thereof.

54. The system of claim 51, wherein:

the radiation detection subsystem comprises a plurality of radiation detectors, each detector corresponding to a different zone of the platform; and

the processing subsystem is operable to determine the zone in which a sensed radioactive object is likely to be located.

55. The system of claim 51, wherein the metal detection subsystem comprises:

a magnetic field generator; and

a magnetic field detector.

56. The system of claim 51, wherein:

the metal detection subsystem comprises a plurality of magnetic field detectors, each detector corresponding to a different zone of the platform; and

the processing subsystem is operable to determine the zone in which a metallic object is likely to be located.

57. The system of claim 51, further comprising a presence subsystem coupled to the processing subsystem, the presence subsystem operable to determine when a carrier is in the passage of the platform.

58. The system of claim 57, wherein the processing subsystem is operable to:

perform background radiation calculations when the presence subsystem does not detect a carrier in the passage; and

perform radioactive object detection calculations when the presence subsystem does detect a carrier in the passage.

59. The system of claim 51, further comprising an alarm subsystem coupled to the processing subsystem, the alarm subsystem operable to generate a user intelligible signal if an illicit object may be in the passage.

60. The system of claim 59, wherein the alarm subsystem is operable to provide an indication of where an illicit object may be located on a carrier.

61. A system for scanning carriers for objects, comprising:

a user support platform;

a metal detection subsystem coupled to the platform, the metal detection subsystem operable to sense a metallic object in a localized area of a detection proximity of the platform and to form a signal indicative thereof;

a radiation detection subsystem coupled to the platform, the radiation detection subsystem operable to sense a radioactive object in the detection proximity of the platform and to form a signal indicative thereof; and

a processing subsystem coupled to the metal detection subsystem and the radiation detection subsystem, the processing subsystem operable to determine, based on the signals from the metal detection subsystem and the radiation detection subsystem, if an illicit object may be in the detection proximity of the platform.

62. The system of claim 61, wherein the platform comprises a housing.

63. The system of claim 61, wherein the radiation detection subsystem comprises:

a scentillator operable to sense the presence of a radioactive object and to generate a light signal indicative thereof;

a photomultiplier tube operable to amplify the light signal; and

a photodetector operable to detect the amplified light signal and to generate an electrical signal indicative thereof.

64. The system of claim 61, wherein the metal detection subsystem comprises:

a magnetic field generator; and

a magnetic field detector.

65. The system of claim 61, further comprising a presence subsystem coupled to the processing subsystem, the presence subsystem operable to determine when a carrier is in the detection proximity of the platform.

66. The system of claim 61, further comprising an alarm subsystem coupled to the processing subsystem, the alarm subsystem operable to generate a user intelligible signal if an illicit object may be in the detection proximity of the platform.

67. The system of claim 66, wherein the alarm subsystem provides a different signal depending on whether an illicit radioactive object or an illicit metallic object may be in the detection proximity of the platform.

68. The system of claim 61, wherein the area comprises the anal/vagina region of a carrier.

69. The system of claim 61, further comprising a second metal detection subsystem coupled to the platform, the second metal detection subsystem operable to sense a metallic object in a second localized area and to form a signal indicative thereof.

70. The system of claim 69, wherein the area comprises the oral/facial region of a carrier.

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

a hand-held platform;

a metal detection subsystem coupled to the platform, the metal detection subsystem operable to sense a metallic object in a detection proximity of the platform and to form a signal indicative thereof;

a radiation detection subsystem coupled to the platform, the radiation detection subsystem operable to sense a radioactive object in the detection proximity of the platform and to form a signal indicative thereof; and

a processing subsystem coupled to the metal detection subsystem and the radiation detection subsystem, the processing subsystem operable to determine, based on the signals from the metal detection subsystem and the radiation detection subsystem, if an illicit object may be in the detection proximity of the platform.

72. The system of claim 71, wherein the platform comprises a housing.

73. The system of claim 71, wherein the radiation detection subsystem comprises:

a scentillator operable to sense the presence of a radioactive object and to generate a light signal indicative thereof;

a photomultiplier tube operable to amplify the light signal; and

a photodetector operable to detect the amplified light signal and to generate an electrical signal indicative thereof.

74. The system of claim 71, wherein the metal detection subsystem comprises:

a magnetic field generator; and

a magnetic field detector.

75. The system of claim 71, further comprising a presence subsystem coupled to the processing subsystem, the presence subsystem operable to determine when a carrier is in the detection proximity of the platform.

76. The system of claim 75, wherein the processing subsystem is operable to perform background radiation calculations when the presence subsystem does not detect a carrier in the detection proximity of the platform.

77. The system of claim 71, further comprising an alarm subsystem coupled to the processing subsystem, the alarm subsystem operable to generate a user intelligible signal if an illicit object may be in the detection proximity of the platform.

78. The system of claim 76, wherein the indication is different for metallic objects and radioactive objects.

79. A system for scanning carriers for objects, comprising:

a platform including a pass-through passage;

a metal detection subsystem coupled to the platform, the metal detection subsystem operable to sense a metallic object in the passage and to form a signal indicative thereof;

a radiation detection subsystem coupled to the platform, the radiation detection subsystem operable to sense a radioactive object in the passage and to form a signal indicative thereof; and

a processing subsystem coupled to the metal detection subsystem and the radiation detection subsystem, the processing subsystem operable to determine, based on the signals from the metal detection subsystem and the radiation detection subsystem, if an illicit object may be in the passage.

80. The system of claim 79, wherein the platform comprises a housing.

81. The system of claim 79, wherein the radiation detection subsystem comprises:

a scentillator operable to sense the presence of a radioactive object and to generate a light signal indicative thereof;

a photomultiplier tube operable to amplify the light signal; and

a photodetector operable to detect the amplified light signal and to generate an electrical signal indicative thereof.

82. The system of claim 79, wherein the metal detection subsystem comprises:

a magnetic field generator; and

a magnetic field detector.

83. The system of claim 79, further comprising a presence subsystem coupled to the processing subsystem, the presence subsystem operable to determine when a carrier is in the detection proximity of the platform.

84. The system of claim 83, wherein the processing subsystem is operable to perform background radiation calculations when the presence subsystem does not detect a carrier in the passage.

85. The system of claim 79, further comprising an alarm subsystem coupled to the processing subsystem, the alarm subsystem operable to generate a user intelligible signal if an illicit object may be in the passage.

86. The system of claim 85, wherein the indication is different for metallic objects and radioactive objects.

87. A system for scanning carriers for objects, comprising:

a housing, comprising;

a first vertical support, and

a second vertical support, wherein the vertical supports define a walk-through passage;

a metal detection subsystem contained in the housing, the metal detection subsystem comprising;

an oscillator,

a magnetic field generator in the first vertical support and a magnetic field generator in the second vertical support, the generators coupled to the oscillator, wherein the generators are operable to generate a magnetic field in the passage when excited by the oscillator,

a plurality of magnetic field detectors in the first vertical support and a plurality of magnetic field detectors in the second vertical support, each detector corresponding to a different zone of the passage and operable to sense a metallic object in the passage to form a signal indicative thereof;

a radiation detection subsystem contained in the housing, the radiation detection subsystem comprising;

a plurality of scentillators in the first vertical support and a plurality of scentillators in the second vertical support, each scentillator corresponding to a different zone of the passage, the scentillators operable to sense gamma rays in the passage and to generate a light signal indicative thereof,

a plurality of photomultiplier tubes, each scentillator having an associated tube, the tubes operable to amplify the light signals, and

a plurality of photodetectors, each tube having an associated photodetector, the photodetectors operable to detect the amplified light signals and to form an electrical signal indicative thereof;

a presence subsystem coupled to the housing, the subsystem operable to detect a carrier in the passage;

a processing subsystem contained in the housing, the processing subsystem coupled to the metal detection subsystem, the radiation detection subsystem and the presence subsystem, the processing subsystem operable to;

determine, based on the signals from the metal detection subsystem, if an illicit metallic object may be in the passage and in which zone the object may be located,

determine, based on the signals from the radiation detection subsystem, if an illicit radioactive object may be in the passage and in which zone the object may be located, and

perform background radiation calculations when the presence subsystem does not detect a carrier in the passage;

an alarm subsystem contained in the housing, the alarm subsystem coupled to the processing subsystem and operable to generate a user intelligible signal if an illicit object may be in the passage, the alarm subsystem comprising;

a visual portion operable to provide an indication of where an illicit object may be located on a carrier, the indication being different for metallic objects and radioactive objects, and

an acoustic portion operable to generate a first sound if an illicit metallic object may be present and a second sound if an illicit radioactive object may be present.