System and method for locating radiation sources

• US 10,024,981 B2
• Filed: 04/24/2015
• Issued: 07/17/2018
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: Oregon State University (Oregon University System)
• Original Assignee: Oregon State University (Oregon University System)
• Inventors: Farsoni, Abdollah Tavakoli, Becker, Eric Matthew
• Primary Examiner(s): Kim, Kiho
• Application Number:
  US15/128,350
• Publication Number:
  US 20170293036A1
• Time in Patent Office: 1,180 Days
• CPC Class Codes: B64C 39/024 of the remote controlled vehicle type, i.e. RPV
• CPC Class Codes: B64U 2101/00 UAVs specially adapted for particular uses or applications
• CPC Class Codes: B64U 2101/17 for detecting, disrupting or countering communications
• CPC Class Codes: B64U 2201/10 autonomous, i.e. by navigating independently from ground or air stations, e.g. by using inertial navigation systems [INS]
• CPC Class Codes: G01T 1/2018 Scintillation-photodiode combinations
• CPC Class Codes: G01T 1/20186 Position of the photodiode with respect to the incoming radiation, e.g. in the front of, below or sideways the scintillator
• CPC Class Codes: G01T 1/20188 Auxiliary details, e.g. casings or cooling
• CPC Class Codes: G01T 1/202 the detector being a crystal
• CPC Class Codes: G01T 7/00 Details of radiation-measuring instruments

Abstract

A radiation detection system is disclosed comprising of number of detector elements arranged in a regular pattern that allows for directional information to be collected based on the number of radiation interaction events in each detection element. This system is mounted to an unmanned vehicle. In some embodiments, this information is used by the motion control unit of the unmanned vehicle to guide its movement toward a radiation source. A radiation spectrometer, also integrated in the detection system, is able to identify radiation sources.

Claims

1. A method for detection and locating a source of radiation, comprising:

providing a plurality of radiation detectors mounted to a vehicle;

comparing count rates amongst the plurality of radiation detectors to determine a direction in which the vehicle should move to locate the source of radiation;

rotating the plurality of radiation detectors in unison using a common gear so that the plurality of radiation detectors are at a same angle relative to a horizontal plane so as to maximize a detection efficiency for detecting radiation emitted from a source in the vicinity of the vehicle as the vehicle moves towards the source of radiation; and

determining that the vehicle has reached the source of radiation.

2. The method of claim 1, wherein determining that the vehicle has reached the source of radiation includes detecting that a count rate in each of the plurality of radiation detectors is statistically equal.

3. The method of claim 1, further including measuring the energy of radiation using the plurality of detectors or a separate detector to identify a source of radiation.

4. The method of claim 1, wherein the plurality of detectors are positioned in a circular pattern or other geometric pattern around a central point.

5. The method of claim 1, further including moving the vehicle in a direction associated with a group of the plurality of detectors having the highest count rates.

6. An apparatus for detection and locating a source of radiation, comprising:

a plurality of rotatable detectors positioned on a vehicle, wherein the plurality of rotatable detectors are coupled to a common gear so as to rotate in unison to a common angle; and

a controller coupled to the plurality of detectors to determine a direction of the source of radiation based on count rates received from the plurality of detectors and to direct the vehicle on a direction to proceed to locate the source of radiation.

7. The apparatus of claim 6, wherein the plurality of detectors are rotatable from a vertical to a horizontal position.

8. The apparatus of claim 6, further including a detector coupled to circuitry programmed for determining a type of the radiation source.

9. The apparatus of claim 6, wherein the plurality of detectors are positioned in a circular pattern around a frame of the vehicle.

10. The apparatus of claim 6, wherein each of the detectors include scintillator material, a light readout device coupled to the scintillator material and electronics coupled to the light readout device for supplying a digital signal associated with a radiation reading to a central processing unit.

11. A multi-element radiation measurement system, comprising:

a plurality of radiation detection panels arranged in a pattern around a central point with substantially equidistant spacing there between and coupled together so as to rotate in unison to a common angle, the plurality of radiation detection panels for generating radiation event information in response to receiving a flux of radiation emitted from a radiation source;

a controller coupled to the plurality of radiation detection panels for rotating the radiation detection panels in response to receiving the flux of radiation so as to maximize detecting the flux of radiation; and

at least one radiation spectrometer device coupled to the controller that provides energy information based on interaction with the flux of radiation emitted from the radiation source so as to identify a type of radiation source or radionuclide.

12. The multi-element radiation measurement system of claim 11, wherein the multi-element radiation measurement system is mounted on a vehicle and the controller is for determining a direction of the radiation source based on the radiation event information.

13. The multi-element radiation measurement system of claim 12, wherein the controller is adapted to move the vehicle automatically in conjunction with other navigational sensors in the direction of the radiation source.

14. The multi-element radiation measurement system of claim 13, wherein the controller is adapted to rotate the plurality of radiation detection panels automatically as the vehicle moves.

15. The multi-element radiation measurement system of claim 11, wherein each of the radiation detection panels include a radiation detector and electronics for supplying a digital signal associated with a radiation reading to the controller.