Cellular telephone-based radiation detection instrument

• US 7,960,700 B2
• Filed: 09/29/2006
• Issued: 06/14/2011
• Est. Priority Date: 01/24/2003
• Status: Active Grant

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Inventors: Labov, Simon E., Craig, William W.
• Primary Examiner(s): Porta; David P
• Assistant Examiner(s): Taningco; Marcus H
• Application Number:
  US11/541,341
• Publication Number:
  US 20070018807A1
• Time in Patent Office: 1,719 Days
• Field of Search: 250/370.01
• US Class Current: 250/370.01
• CPC Class Codes: G01J 1/00 Photometry, e.g. photographic exposure meter spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ; exposure meters built in cameras G03B17/06
• CPC Class Codes: G01T 1/026 Semiconductor dose-rate meters
• CPC Class Codes: G01T 7/00 Details of radiation-measuring instruments

Abstract

A network of radiation detection instruments, each having a small solid state radiation sensor module integrated into a cellular phone for providing radiation detection data and analysis directly to a user. The sensor module includes a solid-state crystal bonded to an ASIC readout providing a low cost, low power, light weight compact instrument to detect and measure radiation energies in the local ambient radiation field. In particular, the photon energy, time of event, and location of the detection instrument at the time of detection is recorded for real time transmission to a central data collection/analysis system. The collected data from the entire network of radiation detection instruments are combined by intelligent correlation/analysis algorithms which map the background radiation and detect, identify and track radiation anomalies in the region.

Claims

1. A radiation detection instrument comprising:

a mobile communications device having wireless means for communicating over a wireless communications network from various locations;

a radiation detector operably connected to said mobile communications device for measuring the individual energies of detected photons in list mode at said various locations;

a clock-calendar operably connected to said mobile communications device for determining the time-date associated with each detected photon in list mode;

a locator operably connected to said mobile communications device for determining the location of said instrument associated with each detected photon; and

means for analyzing radiation data collected by the radiation detector to identify isotopes from the radiation data individual photon energies detected at said various locations, the detection time-date associated with each detected photon, and the instrument location associated with each detected photon, and displaying said data via the mobile communications device.

2. The instrument of claim 1,

wherein said mobile communications device is a cellular phone.

3. The instrument of claim 1,

wherein said wireless means is adapted to communicate with a data server of a central monitoring system over the wireless communications network.

4. The instrument of claim 3,

wherein said wireless means is adapted to access the Internet using a web-based protocol for data transmission.

5. The instrument of claim 3,

wherein said wireless means is adapted to access the Internet using an always-on mobile Internet connection system.

6. The instrument of claim 1,

wherein said locator is a coordinate locator based on an absolute coordinate system of location identification.

7. The instrument of claim 6,

wherein said coordinate locator is a GPS receiver.

8. The instrument of claim 1,

wherein said radiation detector comprises a room temperature-operable solid state semiconductor material for measuring gammy-ray photons and/or neutrons.

9. The instrument of claim 8,

wherein said radiation detector is formed from a material selected from a group consisting of cadmium zinc telluride, cadmium telluride, mercuric iodide, lead iodide and aluminum antimonide.

10. The instrument of claim 8

further comprising a temperature sensor capable of measuring the temperature of the room temperature-operable solid state semiconductor material;

and means for adjusting the overall gain of the semiconductor material as a function of time based on the temperature measured by said temperature sensor, to improve spectral resolution of said radiation detector.

11. The instrument of claim 8,

wherein said radiation detector is pixelated.

12. The instrument of claim 11,

wherein pixels located in regions of the detector having imperfections are disabled to improve overall detector resolution.

13. The instrument of claim 1,

wherein said radiation detector is interconnected to a low-power VLSI readout.

14. The instrument of claim 1,

further comprising means for alerting a user upon isotope identification.

15. The instrument of claim 14

wherein the means for alerting is adapted to be triggered when a predetermined level of radiation is detected.

16. The instrument of claim 15

wherein the means for alerting is adapted not to be triggered when a benign isotope is identified, despite detection of the predetermined level of radiation.

17. A radiation detection instrument comprising:

a mobile communications device having wireless means for communicating with a data server of a central monitoring system over a wireless communications network from various locations;

a radiation detector operably connected to said mobile communications device for measuring the individual energies of detected photons at said various locations in list mode;

a clock-calendar operably connected to said mobile communications device for determining the time-date associated with each detected photon in list mode; and

a locator operably connected to said mobile communications device for determining the location of said instrument associated with each detected photon,

wherein said mobile communications device is adapted to transmit radiation data of the individual photon energies detected at said various locations and the corresponding detection time-date and detection location associated with each to the data server of said central monitoring system.

18. The instrument of claim 17

wherein said mobile communications device is a cellular phone.

19. The instrument of claim 17

wherein the wireless means is adapted to access the Internet using a web-based protocol for data transmission.

20. The instrument of claim 17

wherein said wireless means is adapted to access the Internet using an always-on mobile Internet connection system.

21. The instrument of claim 17

wherein said locator is a coordinate locator based on an absolute coordinate system of location identification.

22. The instrument of claim 21

wherein said coordinate locator is a GPS receiver.

23. The instrument of claim 17

wherein said radiation detector comprises a room temperature-operable solid state semiconductor material for measuring gammy-ray photons and/or neutrons.

24. The instrument of claim 23

wherein said radiation detector is formed from a material selected from a group consisting of cadmium zinc telluride, cadmium telluride, mercuric iodide, lead iodide and aluminum antimonide.

25. The instrument of claim 23

further comprising a temperature sensor capable of measuring the temperature of the room temperature-operable solid state semiconductor material;

and means for adjusting the overall gain of the semiconductor material as a function of time based on the temperature measured by said temperature sensor, to improve spectral resolution of said radiation detector.

26. The instrument of claim 23

wherein said radiation detector is pixelated.

27. The instrument of claim 26

wherein pixels located in regions of the detector having imperfections are disabled to improve overall detector resolution.

28. The instrument of claim 17

wherein said radiation detector is interconnected to a low-power VLSI readout.

29. The instrument of claim 17,

further comprising means for alerting a user upon isotope detection.

30. The instrument of claim 29

wherein the means for alerting is adapted to be triggered when a predetermined level of radiation is detected.

31. The instrument of claim 30

wherein the means for alerting is adapted not to be triggered when a benign isotope is identified, despite detection of the predetermined level of radiation.