POLYMER LAYER ON X-RAY WINDOW

• US 20130094629A1
• Filed: 12/05/2012
• Published: 04/18/2013
• Est. Priority Date: 10/07/2010
• Status: Active Grant

• Current Assignee: Moxtek (Polatechno Co.,Ltd.)
• Original Assignee: Moxtek (Polatechno Co.,Ltd.)
• Inventors: Liddiard, Steven, Taylor, Brian, Decker, Keith, Maynard, Jason
• Granted Patent: US 8,964,943 B2
• Time in Patent Office: Days
• US Class Current: 378/140
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G21K 1/00 Arrangements for handling particles or ionising radiation, e.g. focusing or moderating production or acceleration of neutrons, electrically-charged particles, neutral molecular beams or neutral atomic beams H05H3/00 - H05H15/00
• CPC Class Codes: H01J 2235/18 Windows, e.g. for X-ray transmission
• CPC Class Codes: H01J 2235/183 Multi-layer structures
• CPC Class Codes: H01J 35/18 Windows
• CPC Class Codes: H01J 5/18 Windows permeable to X-rays, gamma-rays, or particles

Abstract

An x-ray window includes a mount with a support frame and an aperture. A window film has a stack of layers including: a thin film layer comprising a material selected from the group consisting of diamond, graphene, diamond-like carbon, beryllium, and combinations thereof; a boron hydride layer; and a polymer layer. The window film, including the thin film layer, the boron hydride layer, and the polymer layer, extends across the aperture and is supported by the support frame. The window film is attached to the support frame, defining a sealed joint. The layers are capable of withstanding a differential pressure of at least 1 atmosphere. The window film is substantially transmissive to x-rays having an energy in the range of 100-20,000 electronvolts.

Claims

1. An x-ray window comprising:

a. a mount, including a support frame and an aperture;

b. a window film having a stack of layers including;

i. a thin film layer comprising a material selected from the group consisting of diamond, graphene, diamond-like carbon, beryllium, and combinations thereof;

ii. a boron hydride layer; and

iii. a polymer layer;

c. the window film, including the thin film layer, the boron hydride layer, and the polymer layer, extending across the aperture and supported by the support frame;

d. the window film attached to the support frame defining a sealed joint;

e. the layers are capable of withstanding a differential pressure of at least 1 atmosphere; and

f. the window film substantially transmissive to x-rays having an energy in the range of 100-20,000 electronvolts.

2. The x-ray window of claim 1, wherein:

a. the sealed joint comprises a bond between the thin film layer and the mount at a perimeter of the thin film layer;

b. the boron hydride layer and the polymer layer extend beyond the perimeter of the thin film layer; and

c. the boron hydride layer and the polymer layer provide corrosion protection to the sealed joint.

3. The x-ray window of claim 2, wherein the bond is a diffusion bond, a brazed bond, or a soldered bond.

4. The x-ray window of claim 2, wherein the boron hydride layer is a first boron hydride layer, and further comprising:

a. a second boron hydride layer disposed on an opposite side of the thin film layer from the first boron hydride layer;

b. the second boron hydride layer extending across the aperture of the mount;

c. the second boron hydride layer extending beyond the perimeter of the thin film layer to cover the sealed joint; and

d. the second boron hydride layer providing corrosion protection to the sealed joint.

5. The x-ray window of claim 4, wherein the polymer layer is a first polymer layer, and further comprising:

a. a second polymer layer disposed on an opposite side of the thin film layer from the first polymer layer;

b. the second polymer layer extending across the aperture of the mount;

c. the second polymer layer extending beyond the perimeter of the thin film layer to cover the sealed joint; and

d. the second polymer layer providing corrosion protection to the sealed joint.

6. The x-ray window of claim 1, wherein the sealed joint is a diffusion bond, a brazed bond, or a soldered bond between the thin film layer and the mount.

7. The x-ray window of claim 1, wherein the thin film layer is disposed between the boron hydride layer and the polymer layer.

8. The x-ray window of claim 1, wherein the polymer layer is disposed between the thin film layer and the boron hydride layer.

9. The x-ray window of claim 1, wherein the polymer layer comprises a polyimide.

10. The x-ray window of claim 1, wherein:

a. the thin film layer has a thickness of about 5 to 500 micrometers;

b. the boron hydride layer has a thickness of about 20 to 2000 nanometers; and

c. the polymer layer has a thickness of about 50 to 1200 nanometers.

11. The x-ray window of claim 1, wherein:

a. the thin film layer has a thickness of about 5 to 12 micrometers;

b. the boron hydride layer has a thickness of about 800 to 1600 nanometers; and

c. the polymer layer has a thickness of about 20 to 300 nanometers.

12. The x-ray window of claim 1, wherein:

a. the thin film layer has a thickness of about 50 to 1200 nanometers;

b. the boron hydride layer has a thickness of about 20 to 2000 nanometers; and

c. the polymer layer has a thickness of about 50 to 1200 nanometers.

13. The x-ray window of claim 1, further comprising an x-ray tube and wherein the window is mounted on the x-ray tube.

14. The x-ray window of claim 1, further comprising an x-ray detector, and wherein the window is attached to the x-ray detector and the window film allow x-rays to pass through the window film and impinge upon the detector.

15. An x-ray window comprising:

a. a mount, including a support frame and an aperture;

b. a window film having a stack of layers including a beryllium layer and a polyimide layer;

c. the window film, including the beryllium layer and the polyimide layer, extending across the aperture and supported by the support frame;

d. the beryllium layer attached to the support frame at a perimeter of the beryllium layer defining a sealed joint;

e. the polyimide layer extending beyond the perimeter of the beryllium layer;

f. the polyimide layer providing corrosion protection to the sealed joint; and

g. the window film capable of withstanding a differential pressure of at least 1 atmosphere and substantially transmissive to x-rays having an energy in the range of 100-20,000 electronvolts.

16. The x-ray window of claim 15, wherein the sealed joint is a diffusion bond, a brazed bond, or a soldered bond.

17. The x-ray window of claim 15, wherein the polyimide layer is a first polyimide layer, and further comprising:

a. a second polyimide layer disposed on an opposite side of the beryllium layer from the first polyimide layer;

b. the second polyimide layer extending across the aperture and supported by the support frame;

c. the second polyimide layer extending beyond the perimeter of the thin film layer to cover the sealed joint; and

d. the second polyimide layer providing corrosion protection to the sealed joint.

18. An x-ray window comprising:

a. a mount, including a support frame and an aperture;

b. a window film having a stack of layers including a beryllium layer, a boron hydride layer, and a polyimide layer;

c. the window film, including the beryllium layer, the boron hydride layer, and the polyimide layer, extending across the aperture and supported by the support frame;

d. the beryllium layer attached to the support frame at a perimeter of the beryllium layer defining a sealed joint;

e. the boron hydride layer and the polyimide layer extending beyond the perimeter of beryllium layer;

f. the boron hydride layer and the polyimide layer providing corrosion protection to the sealed joint; and

g. the window film capable of withstanding a differential pressure of at least 1 atmosphere.

19. The x-ray window of claim 18, wherein the boron hydride layer is disposed between the beryllium layer and the polymer layer.

20. The x-ray window of claim 19, wherein the boron hydride layer is a first boron hydride layer, and further comprising:

a. a second boron hydride layer disposed on an opposite side of the thin film layer from the first boron hydride layer;

b. the second boron hydride layer extending across the aperture and supported by the support frame;

c. the second boron hydride layer extending beyond the perimeter of the thin film layer to cover the sealed joint; and

d. the second boron hydride layer providing corrosion protection to the sealed joint.