Integrated neutron-gamma radiation detector with optical waveguide and neutron scintillating material

• US 7,741,612 B2
• Filed: 02/07/2008
• Issued: 06/22/2010
• Est. Priority Date: 02/07/2008
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Clothier, Brent Allen, Ivan, Adrian, McDevitt, Daniel Bruno
• Primary Examiner(s): Porta; David P
• Assistant Examiner(s): Kim; Kiho
• Application Number:
  US12/027,828
• Publication Number:
  US 20090200480A1
• Time in Patent Office: 866 Days
• Field of Search: 25039001-39012
• US Class Current: 250/390.01
• CPC Class Codes: G01T 1/202 the detector being a crystal
• CPC Class Codes: G01T 3/06 with scintillation detectors

Abstract

An integrated neutron-gamma radiation detector includes a gamma sensing element, a neutron sensing element comprising a neutron scintillating material at least partially surrounded by an optical waveguide material, and a photosensing element optically coupled to both the gamma sensing element and the neutron sensing element. A portion of the gamma sensing element is capable of being disposed within a central aperture of the neutron sensing element. In one aspect, the neutron sensing element comprises a plurality of cylindrical, concentric shells forming the central aperture for receiving the gamma sensing element. In another aspect, the neutron sensing element comprises a plurality of strands forming a multi-layered structure and forming the central aperture for receiving the gamma sensing element.

Claims

1. An integrated neutron-gamma radiation detector, comprising:

a gamma sensing element;

a neutron sensing element comprising a neutron scintillating material at least partially surrounded by an optical waveguide material, at least a portion of the gamma sensing element being disposed within a central aperture of the neutron sensing element; and

a photosensing element optically coupled to both the gamma sensing element and the neutron sensing element,

wherein photons emitted from the neutron sensing element are collected and channeled through the optical waveguide material and into the photosensing element.

2. The detector according to claim 1, wherein the neutron sensing element comprises a plurality of cylindrical, concentric shells forming the central aperture of the neutron sensing element.

3. The detector according to claim 2, wherein at least one shell of the plurality of cylindrical shells is substantially aligned along a longitudinal axis of the detector.

4. The detector according to claim 1, wherein the neutron sensing element comprises a plurality of strands.

5. The detector according to claim 4, wherein the plurality of strands form a layered structure forming the central aperture of the neutron sensing element.

6. The detector according to claim 4, wherein each strand comprises a solid core of the neutron scintillating material disposed within the optical waveguide material.

7. The detector according to claim 4, wherein each strand comprises a plurality of cylindrical, concentric shells.

8. The detector according to claim 4, wherein at least one strand of the plurality of strands is substantially aligned along a longitudinal axis of the detector.

9. The detector according to claim 1, wherein the optical waveguide material comprises an optical waveguide.

10. An integrated neutron-gamma radiation detector, comprising:

a gamma sensing element;

a neutron sensing element comprising a neutron scintillating material at least partially surrounded by an optical waveguide material, at least a portion of the gamma sensing element being disposed within a central aperture of the neutron sensing element, wherein the neutron sensing element comprises a plurality of cylindrical, concentric shells forming the central aperture of the neutron sensing element; and

a photosensing element optically coupled to both the gamma sensing element and the neutron sensing element,

wherein photons emitted from the neutron sensing element are collected and channeled through the optical waveguide material and into the photosensing element.

11. The detector according to claim 10, wherein the plurality of cylindrical shells are substantially aligned with a longitudinal axis of the detector.

12. The detector according to claim 10, wherein the neutron scintillating material and the optical waveguide material alternate between each shell of the plurality of cylindrical shells.

13. The detector according to claim 10, wherein the optical waveguide material comprises an optical waveguide.

14. An integrated neutron-gamma radiation detector, comprising:

a gamma sensing element;

a neutron sensing element comprising a neutron scintillating material at least partially surrounded by an optical waveguide material, at least a portion of the gamma sensing element being disposed within a central aperture of the neutron sensing element, wherein the neutron sensing element comprises a plurality of strands; and

a photosensing element optically coupled to both the gamma sensing element and the neutron sensing element,

wherein photons emitted from the neutron sensing element are collected and channeled through the optical waveguide material and into the photosensing element.

15. The detector according to claim 14, wherein the plurality of strands form a layered structure forming the central aperture of the neutron sensing element.

16. The detector according to claim 14, wherein each strand comprises a solid core of the neutron scintillating material disposed within the optical waveguide material.

17. The detector according to claim 14, wherein each strand comprises a plurality of cylindrical, concentric shells.

18. The detector according to claim 14, wherein at least one strand of the plurality of strands is substantially aligned along a longitudinal axis of the detector.

19. The detector according to claim 14, wherein the optical waveguide material comprises an optical waveguide.

20. A method of detecting radiation in an integrated neutron-gamma detector, the method comprising the steps of:

disposing a neutron scintillating material within an optical waveguide material to form a neutron sensing element;

disposing at least a portion of a gamma sensing element within the neutron sensing element; and

optically coupling both the neutron sensing element and the gamma element to a photosensing element,

whereby photons emitted from the neutron sensing element are collected and channeled through the optical waveguide material and into the photosensing element.