Isotope production target

Patent metadata

Field	Value
Publication number	US-9396826-B2
Application number	US-201113192300-A
Country	US
Kind code	B2
Filing date	Jul 27, 2011
Priority date	Jul 29, 2010
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

An isotope production target may include an outer diameter wall and an inner diameter wall. An isotope source may be located between the inner diameter wall and the outer diameter wall, and the isotope source may comprise fissile material interspersed with one or more voided regions. A central region may be located within the inner diameter wall, and the central region may be configured to house a neutron thermalization volume.

First claim

The invention claimed is:

1. An isotope production target, comprising:
an outer diameter wall;
an inner diameter wall located within the outer diameter wall, wherein a top of both the inner diameter wall and the outer diameter are sealed together and a bottom of both the inner diameter wall and the outer diameter are sealed together to form a sealed chamber;
an isotope source comprising particles of fissile material loosely placed between the inner diameter wall and the outer diameter wall to facilitate removal of the loosely placed particles of fissile material after irradiation of the isotope production target, wherein the loosely placed particles of fissile material are in contact with each other and interspersed with a plurality of voided regions around each of the loosely placed particles of fissile material in the sealed chamber to capture fission gases released from the loosely placed particles of fissile material due to the irradiation of the isotope production target; and
a central region located within the inner diameter wall, wherein the central region houses a neutron thermalization volume.

2. The isotope production target of claim 1 , wherein the plurality of voided regions located in the sealed chamber capture the fission gases produced from irradiation of the loosely placed particles of fissile material, and wherein the plurality of voided regions remain in place during operation of the isotope production target.

3. The isotope production target of claim 2 , wherein the one or more voided regions are sealed between the outer diameter wall and the inner diameter wall to prevent the fission gases from exiting the isotope production target.

4. The isotope production target of claim 1 , wherein the loosely placed particles of fissile material are substantially ball-shaped, and wherein the plurality of voided regions are formed around contact points of adjacent ball-shaped particles.

5. The isotope production target of claim 1 , wherein the loosely placed particles of fissile material comprise powder, and wherein the plurality of voided regions are formed around contact points of adjacent particles of the powder.

6. The isotope production target of claim 1 , wherein the neutron thermalization volume comprises water.

7. The isotope production target of claim 6 , wherein the isotope production target is configured to be installed in a reactor core, and wherein the water comprises a primary coolant associated with the reactor core.

8. The isotope production target of claim 7 , wherein the reactor core is associated with a reactor of less than twenty megawatts thermal, and wherein the isotope source comprises low-enriched uranium (LEU).

9. The isotope production target of claim 1 , wherein the central region is configured to cause neutrons that are generated in the loosely placed particles of fissile material to be thermalized by the neutron thermalization volume before re-entering the loosely placed particles of fissile material.

10. The isotope production target of claim 1 , wherein the loosely placed particles of fissile material comprise substantially round balls of fissile material.

11. The isotope production target of claim 1 , wherein the loosely placed particles of fissile material comprise fissile powder.

12. The isotope production target of claim 1 , wherein the sealed chamber comprises an annular-shaped isotope production chamber located between the outer diameter wall and the inner diameter wall, and wherein one or more of the loosely placed particles of fissile material are in contact with at least one other particle located along a circumference of the annular-shaped isotope production chamber.

13. An isotope production target, comprising:
an isotope source comprising particles of fissile material;
means for housing the particles of fissile material, wherein the particles of fissile material are loosely placed within the means for housing to facilitate removal of the loosely placed particles of fissile material after irradiation of the isotope production target, and wherein the loosely placed particles of fissile material are interspersed with a plurality of voided regions around contact points of laterally adjacent particles located in a circumference of the means for housing to capture fission gases released from the loosely placed particles of fissile material due to the irradiation of the isotope production target; and
means for thermalizing neutrons located within a central region of the isotope production target.

14. The isotope production target, of claim 13 , wherein the means for thermalizing comprises primary coolant associated with a reactor core.

15. The isotope production target, of claim 14 , further comprising means for directing the primary coolant through the isotope production target.

16. The isotope production target, of claim 13 , wherein the loosely placed particles of fissile material comprise substantially round balls of fissile material.

17. The isotope production target, of claim 13 , wherein the loosely placed particles of fissile material are stored in a powder form in the means for housing.

18. The isotope production target, of claim 13 , wherein the means for housing comprises an enclosed annular-shaped isotope production chamber, and wherein each of the loosely placed particles of fissile material are in contact with at least one other particle located along a circumference of the annular-shaped isotope production chamber.

19. The isotope production target, of claim 13 , wherein the plurality of voided regions are configured to capture the fission gases generated from irradiating the loosely placed particles of fissile material located in the means for housing.

20. The isotope production target, of claim 13 , wherein the loosely placed particles of fissile material are substantially ball-shaped, and wherein the plurality of voided regions are formed between contact points of adjacent ball-shaped particles.

21. The isotope production target, of claim 13 , further comprising:
means for directing primary coolant associated with a reactor core to pass through the central region.

22. The isotope production target of claim 21 , wherein the primary coolant is directed through the central region of the isotope production target to thermalize neutrons generated by the isotope production target before the neutrons re-enter the loosely placed particles of fissile material and generate further neutrons that are thermalized by the primary coolant in the central region.

Assignees

• Reese Steven Richard
• Palmer Todd Stephen
• Keller Stephen Todd
• Munk Madicken
• Univ Oregon State

Inventors

• Reese Steven Richard
• Palmer Todd Stephen
• Keller Stephen Todd
• Munk Madicken

Classifications

• G21G1/02 Primary

  in nuclear reactors (by thermonuclear reactions G21B; conversion of nuclear fuel G21C) · CPC title

• G21G2001/0036

  Molybdenum · CPC title

• G21K5/08

  Holders for targets or for other objects to be irradiated · CPC title

• G21G1/00

  Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes (separation of different isotopes of the same element B01D59/00) · CPC title

• Y02E30/30

  Nuclear fission reactors · CPC title