Patent Number: 
Section: claims

1. A device, comprising:a radiation attenuation device, including;a cast monolithic material comprising a cured binder having a cavity defined by at least one wall with an aspect ratio of greater than 25:1, said wall having a thickness of less than 100 microns;said cast monolithic material further comprisinga first cast product demolded from a mold of a plurality of stacked micro-machined metallic foil layers filled with a first cast material; anda second cast material,wherein said first cast product is surrounded by said second cast material and solidified to form said cast monolithic material. 2. The device of claim 1, said radiation attenuation device defining a cell width of between approximately 25 and approximately 3000 microns. 3. The device of claim 1, said radiation attenuation device defining a cell width of between approximately 25 and approximately 2000 microns. 4. The device of claim 1, said radiation attenuation device defining a cell width of between approximately 25 and approximately 1000 microns. 5. The device of claim 1, said radiation attenuation device defining a wall height of up to 10,000 microns. 6. The device of claim 1, said radiation attenuation device defining a grid ratio of less than 4. 7. The device of claim 1, said radiation attenuation device defining a grid ratio of less than 8. 8. The device of claim 1, said radiation attenuation device defining a grid ratio of less than 12. 9. The device of claim 1, said radiation attenuation device defining a non-rectangular cell cross-sectional shape. 10. The device of claim 1, said radiation attenuation device defining a cell having a non-planar wall. 11. The device of claim 1, said cast monolithic material further comprising lead combined with a plurality of dense particles. 12. The device of claim 1, said cast monolithic material further comprising a lead alloy combined with a plurality of dense particles. 13. The device of claim 1, said cured binder comprising a polymer combined with a plurality of dense particles. 14. The device of claim 1, said cast monolithic material having a density of approximately 7.0 grams/cc to approximately 12.5 grams/cc. 15. The device of claim 1 wherein the cast monolithic material further comprises particles having a size ranging from 1 to 150 microns. 16. The device of claim 1 wherein the cured binder is a cured polymer. 17. The device of claim 1 wherein the cured binder is a cured epoxy. 18. The device of claim 1 wherein the cured binder is loaded with metallic powder. 19. The device of claim 1 wherein the one or more walls are configured to attenuate radiation. 20. The device of claim 1, wherein the plurality of micro-machined metallic foil layers are lithographically-derived. 21. The device of claim 1, wherein the plurality of micro-machined metallic foil layers are non-lithographically-derived. 22. A device, comprising:a radiation attenuation device including;a cast monolithic material comprising a cured binder having a cavity defined by at least one wall with an aspect ratio of greater than 25:1 said cast monolithic material having a density of approximately 12.5 grams/cc to approximately 14 grams/cc;said cast monolithic material further comprisinga first cast product demolded from a mold of a plurality of stacked micro-machined metallic foil layers filled with a first cast material; anda second cast material,wherein said first cast product is surrounded by said second cast material and solidified to form said cast monolithic material. 23. The device of claim 22, wherein the plurality of micro-machined metallic foil layers are non-lithographically-derived. 24. A device, comprising a radiation attenuation device including a cast monolithic material comprising a cured binder having a cavity defined by at least one wall with an aspect ratio of greater than 25:1 said radiation attenuation device defining a cell width of between approximately 25 and approximately 250 microns;said cast monolithic material further comprisinga first cast product demolded from a mold of a plurality of stacked micro-machined metallic foil layers filled with a first cast material; anda second cast material,wherein said first cast product is surrounded by said second cast material and solidified to form said cast monolithic material. 25. The device of claim 22, wherein the plurality of micro-machined metallic foil layers are lithographically-derived.