Adaptable radiation monitoring system and method

• US 7,064,336 B2
• Filed: 06/21/2004
• Issued: 06/20/2006
• Est. Priority Date: 06/20/2003
• Status: Active Grant

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Pletcher, David C., Schek, James L., Nelson, Karl E., Riot, Vincent J., Beauchamp, Brock R., Archer, Daniel E., Knapp, David A., Mercer, Michael B., Mauger, G. Joseph
• Primary Examiner(s): Wells, Nikita
• Assistant Examiner(s): Souw, Bernard E.
• Application Number:
  US10/874,127
• Publication Number:
  US 20050023477A1
• Time in Patent Office: 729 Days
• Field of Search: 25037011-37014, 250/370.01, 250/370.09, 250/370.1, 25036301-36302, 250/369, 250/336.1, 378/1, 378/5, 378 8- 11, 378/49, 378/57, 378 62- 65, 378/169, 702/23, 702/26, 702/28, 702/32, 702/40, 702/49
• US Class Current: 250/370.1
• CPC Class Codes: G01T 7/00 Details of radiation-measuring instruments
• CPC Class Codes: G01V 5/26 Passive interrogation, i.e. by measuring radiation emitted by objects or goods
• CPC Class Codes: G01V 5/271 using a network, e.g. a remote expert, accessing remote data or the like

Abstract

A portable radioactive-material detection system capable of detecting radioactive sources moving at high speeds. The system has at least one radiation detector capable of detecting gamma-radiation and coupled to an MCA capable of collecting spectral data in very small time bins of less than about 150 msec. A computer processor is connected to the MCA for determining from the spectral data if a triggering event has occurred. Spectral data is stored on a data storage device, and a power source supplies power to the detection system. Various configurations of the detection system may be adaptably arranged for various radiation detection scenarios. In a preferred embodiment, the computer processor operates as a server which receives spectral data from other networked detection systems, and communicates the collected data to a central data reporting system.

Claims

1. A portable radioactive-material detection system comprising:

at least one non-HPGe radiation detector capable of detecting gamma-radiation and coupled to a multi-channel analyzer capable of collecting spectral data in small time bins of less than about 150 msec, whereby radioactive sources moving at high speeds may be detected;

a computer processor operably connected to the multi-channel analyzer and having a first processing module for determining triggering events from the spectral data;

data storage means operably connected to the computer processor for storing said spectral data;

a power source supplying power to the detection system; and

configurable means for radiation shielding the radiation detector to limit radiation detection to a monitoring area, wherein the computer processor has a second processing module for determining the direction of the moving radioactive source based on the relative spatial arrangement between the radiation shielding means and the radiation detector.

2. The portable radioactive-material detection system of claim 1,

wherein the multi-channel analyzer is a list-mode multi-channel analyzer.

3. The portable radioactive-material detection system of claim 1,

wherein the multi-channel analyzer is capable of collecting greater than about 10 channels of spectral data in small time bins of less than about 150 msec.

4. The portable radioactive-material detection system of claim 1,

wherein the computer processor has a third processing module for performing radioactive source identification from the spectral data associated with a triggering event.

5. The portable radioactive-material detection system of claim 1,

wherein the computer processor has a fourth processing module for communicating spectral data and triggering events to a remote data reporting system.

6. The portable radioactive-material detection system of claim 1,

further comprising a unit housing in which said radiation detector(s), computer processor, data storage means, and power source are mounted.

7. The portable radioactive-material detection system of claim 1,

wherein said radiation detector(s), computer processor, and power source are independent modular components.

8. The portable radioactive-material detection system of claim 1,

wherein the radiation detector(s) is chosen from the group consisting of a NaI, He-3, and scintillator detectors.

9. The portable radioactive-material detection system of claim 1,

wherein the configurable means for radiation shielding is a configurable tungsten shield.

10. The portable radioactive-material detection system of claim 1,

further comprising at least one onboard camera operably connected to the computer processor wherein the computer processor controls the camera(s) to shutter upon determination of a triggering event.

11. The portable radioactive-material detection system of claim 1,

wherein the computer processor includes means for interfacing with at least one more radiation-material detection system in a networked system.

12. The portable radioactive-material detection system of claim 11,

wherein the means for interfacing is adapted to translate data received from the other interfaced detection system(s).

13. The portable radioactive-material detection system of claim 1,

wherein the computer processor includes means for interfacing with an auxiliary device.

14. The portable radioactive-material detection system of claim 13,

wherein the auxiliary device is a second computer providing a user interface for an operator to view the spectral data.

15. The portable radioactive-material detection system of claim 14,

wherein the computer processor is adapted to transmit a notification signal to the second computer upon a triggering event.

16. The portable radioactive-material detection system of claim 13,

wherein the auxiliary device is a camera and the computer processor is adapted to shutter the camera upon a triggering event.

17. A method of monitoring an area for moving radioactive materials comprising the steps of:

providing a portable radiation detector coupled to a multi-channel analyzer and having configurable radiation shielding which limits radiation detection to the monitoring area;

using the portable radiation detector and the multi-channel analyzer to collect spectral data in very small time bins of less than about 150 msec to enable detection of radioactive sources moving at high speeds;

analyzing the spectral data to determine triggering events from the spectral data;

upon a determination of a triggering event, determining the direction of the moving radioactive source based on the spectral data and the relative spatial arrangement between the radiation shielding and the radiation detector, and transmitting the spectral data associated with the triggering event to a central data reporting system.

18. A method in a computer system for monitoring an area for moving radioactive sources, said method comprising the computer-implemented steps of:

controlling a multi-channel analyzer coupled to a radiation detector to collect spectral data in very small time bins of less than about 150 msec. for detecting radioactive sources moving at high speeds with detection windows of less than about 1 second, said radiation detector having configurable radiation shielding which limits radiation detection to the monitoring area;

controlling a first computer processor module to determine the occurrence of triggering events from the spectral data;

controlling a second computer processor module to determine the direction of the moving radioactive source based on the spectral data and the relative spatial arrangement between the radiation shielding and the radiation detector; and

controlling a data storage device operably connected to the first computer processor to store the spectral data and any triggering events for post-collection analysis.

19. The computer-implemented method of claim 18,

further comprising controlling a multimedia device to record the triggering event.

20. The computer-implemented method of claim 19,

wherein the multimedia device is a camera.

21. The computer-implemented method of claim 18,

further comprising controlling a third computer processor module to determine the source identification from spectral data associated with a triggering event.

22. The computer-implemented method of claim 18,

further comprising remote controlling the method steps from a remote network location.

23. The computer-implemented method of claim 18,

wherein the multi-channel analyzer is capable of collecting greater than about 10 channels of spectral data in small time bins of less than about 150 msec.

24. The computer-implemented method of claim 18,

further comprising receiving detection data from at least one other radiation-material detection system interfaced to the computer system.

25. The computer-implemented method of claim 18,

further comprising translating the detection data received from the other interfaced detection system(s).

26. An article of manufacture comprising:

a computer usable medium having computer-readable program code means embodied therein for causing a gamma-radiation detection system to monitor for gamma-radiation sources moving at high speeds, said radiation detector having configurable radiation shielding which limits radiation detection to the monitoring area, the computer-readable program code means in said article of manufticture comprising;

computer-readable program code means for causing the control of a multi-channel analyzer coupled to a radiation detector to collect spectral data in very small time bins of less than about 150 msec. for detecting radioactive sources moving at high speeds;

computer-readable program code means for causing the control of a first computer processor module to determine the occurrence of triggering events from the spectral data;

computer-readable program code means for causing the control of a second computer processor module to determine the direction of the moving radioactive source based on the spectral data and the relative spatial arrangement between the radiation shielding and the radiation detector; and

computer-readable program code means for causing the control of a data storage device operably connected to the first computer processor to store the spectral data and triggering events for post-collection analysis.

27. The article of manufacture of claim 26,

further comprising computer-readable program code means for causing the control of a multimedia device to record the triggering event.

28. The article of manufacture of claim 27

wherein the multimedia device is a camera.

29. The article of manufacture of claim 26,

further comprising computer-readable program code means for causing the control of a third computer processor module to determine the source identification of spectral data associated with a triggering event.

30. The article of manufacture of claim 26,

further comprising computer-readable program code means for causing the control of a fourth computer processor module to determine from the spectral data and the directional placement of a radiation shielding which direction the radioactive source was moving.