Composite dielectric fins in enhanced area boron coated neutron detectors

• US 8,084,747 B2
• Filed: 04/13/2009
• Issued: 12/27/2011
• Est. Priority Date: 04/13/2009
• Status: Active Grant

• Current Assignee: Baker Hughes Holdings LLC (Baker Hughes Company)
• Original Assignee: General Electric Company
• Inventors: Weissman, Eric Martin, Lustig, James Michael
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): Sung, Christine
• Application Number:
  US12/422,426
• Publication Number:
  US 20100258733A1
• Time in Patent Office: 988 Days
• Field of Search: 250/390.01
• US Class Current: 250/390.01
• CPC Class Codes: G01T 3/008 using an ionisation chamber filled with a gas, liquid or solid, e.g. frozen liquid, dielectric G01T3/006 takes precedence

Abstract

A neutron detector that includes a hollow member extending along and circumscribing an axis. The hollow member has an interior surface and bounds a volume. The detector also includes an anode extending within the volume. The detector also includes a cathode that includes at least one fin extending within the volume. The fin has a substrate material with at least one surface. At least part of the interior surface of the hollow member and the surface of the at least one fin have neutron sensitive material thereon.

Claims

1. A neutron detector including:

a hollow member extending along and circumscribing an axis, the hollow member having an interior surface and bounding a volume;

an anode extending within the volume; and

a cathode including at least one fin extending within the volume, the fin having a substrate material with at least one surface, at least part of the interior surface of the hollow member and the surface of the at least one fin having neutron sensitive material thereon.

2. A neutron detector as set forth in claim 1, wherein the substrate material has a dielectric constant less than 2.5.

3. A neutron detector as set forth in claim 2, wherein the substrate material has a dielectric constant less than 2.

4. A neutron detector as set forth in claim 1, wherein the substrate material is non-metal.

5. A neutron detector as set forth in claim 1, wherein the substrate material is selected from the group of polytetrafluoroethylene, polyvinylidene fluoride, NYLON, polyethelyene, polypropylene, polycarbonate, polystyrene, tetrafluorethylene, polychlorotrifluoroethylene (KEL-F) and composite thermoset plastic laminate.

6. A neutron detector as set forth in claim 1, wherein the substrate material has a outgassing value of less than 1.0*10⁶ Torr Liters per second per square centimeter.

7. A neutron detector as set forth in claim 1, wherein the at least one fin extends from the interior surface of the hollow member.

8. A neutron detector as set forth in claim 7, wherein the hollow member has a cylindrical shape that circumscribes the axis.

9. A neutron detector as set forth in claim 8, wherein the at least one fin extends radially inward from the interior surface of the hollow member.

10. A neutron detector as set forth in claim 9, wherein the at least one fin is planar and extends in a plane parallel to the axis.

11. A neutron detector as set forth in claim 9, wherein the at least one fin is planar and extends in a plane perpendicular to the axis.

12. A neutron detector as set forth in claim 8, wherein the at least one fin is spiral to extend both radially inward from the interior surface of the hollow member and along an axial extent.

13. A neutron detector as set forth in claim 1, wherein the at least one fin is planar and extends in a plane parallel to the axis.

14. A neutron detector as set forth in claim 1, wherein the at least one fin is planar and extends in a plane perpendicular to the axis.

15. A neutron detector as set forth in claim 14, wherein the at least one fin is annular and extends about the axis.

16. A neutron detector as set forth in claim 1, wherein the at least one fin is spiral and extends both inward from the interior surface of the hollow member toward the axis and along an axial extent.

17. A neutron detector as set forth in claim 1, wherein the hollow member is centered about the axis and the at least one fin extends to the axis.

18. A neutron detector as set forth in claim 1, wherein the hollow member is centered about the axis and the at least one fin does not extend to the axis.

19. A neutron detector as set forth in claim 1, wherein the at least one fin is part of a multi-fin divider centered on the axis.

20. A neutron detector as set forth in claim 1, wherein the detector is part of a detector array within the hollow member, the array having a plurality of anodes extending within the volume of the hollow member.

21. A neutron detector as set forth in claim 20, wherein the at least one fin is part of a multi-fin divider centered on the axis.

22. A neutron detector as set forth in claim 21, wherein the multi-fin divider divides the volume of the hollow member into a plurality of volume portions.

23. A neutron detector as set forth in claim 1, wherein the neutron sensitive material is B-10.

24. A neutron detector as set forth in claim 18, wherein the fin having two major surfaces and the B-10 is coated on both major surfaces.