Patent Number: 
Section: claims

1. A radiation shielding apparatus comprising:a plurality of positionable radiation-shielding stacks of tiles, wherein the stacks are arranged in a contiguous peripheral configuration; anda tile positioning mechanism configured to extend and retract the tiles in each stack along a vertical axis between a retracted position wherein all the tiles are aligned horizontally and a vertically extended position, wherein in both the retracted position and the extended position, the tiles of each of the plurality of radiation shielding stacks at least partially overlap tiles of subsequent and adjacent tile stack at corresponding opposing and adjacent side-margins thereof, wherein the tiles in each stack have opposed faces with a rail extending in a vertical direction attached to one of the opposed faces and a slide element extending in a vertical direction attached to another of the opposed faces to allow each tile to slide along a length of each adjacent tile within a stack. 2. The apparatus of claim 1, wherein the tiles, as well as their corresponding opposing side-margins, are non-flat. 3. The apparatus of claim 2, wherein the non-flat corresponding opposing side-margins have a zig-zag or V-shaped profile. 4. The apparatus of claim 2, wherein the non-flat corresponding opposing side-margins have a wavy or S-shaped profile. 5. The apparatus of claim 1, wherein the stacks of tiles form a structure having two or more faces, each face including at least one tile stack; and corner tile stacks connecting two adjacent faces thereof. 6. The apparatus of claim 1, wherein corner tile stacks cover an area of at least about a 90° angle between two adjacent faces. 7. The apparatus of claim 1, wherein the rails and slide elements on vertically adjacent pairs of tiles are peripherally spaced apart so that they do not overlap when the tiles are retracted in a stack to reduce thickness. 8. The apparatus of claim 7, wherein the rails and slide elements within a stack are nested in recesses formed the opposed faces of the tiles, thereby providing a compact structure of tiles in a stack. 9. The apparatus of claim 8, wherein the recesses accommodate therein a rail of said tile and a respective slide element of a sequentially adjacent tile. 10. The apparatus of claim 9, wherein the recesses of vertically adjacent tiles within each stack are aligned such that the recesses in vertically adjacent tiles nest when the stack is retracted, thereby providing for a compact structure of tiles in a stack. 11. The apparatus of claim 1, wherein each tile comprises a first side margin with a concave or V-shaped profile and an opposite second side margin with a convex or upside down V-shaped profile, and the tiles of subsequent and adjacent tile stacks are arranged such that the concave or V-shaped profile of the tiles within one stack overlap the convex or upside down V-shaped profile of the tiles within the subsequent and adjacent tile stack. 12. The apparatus of claim 1, wherein the tiles are manufactured from a composite material comprising at least one carbon fiber layer, a binding material and at least one radiation attenuating material. 13. The apparatus of claim 12, wherein the binding material comprises a thermoset resin, a polyester, a vinyl ester, a polyamide, or a combination thereof. 14. The apparatus of claim 13, wherein the thermoset resin comprises an epoxy resin. 15. The apparatus of claim 12, wherein the radiation attenuating material comprises a metal selected from the group consisting of: tungsten; lead; bismuth; antimony; barium; and tantalum, or a combination thereof. 16. The apparatus of claim 12, wherein the composite material further comprises a material selected from the group consisting of: aramid; aluminum; ultra-high-molecular-weight polyethylene; and glass fibers, and a combination thereof. 17. The apparatus of claim 12, wherein the composite material comprises a plurality of carbon fiber layers; and a mixture of a binding material and particles of radiation attenuating material. 18. The apparatus of claim 12, wherein the radiation attenuating material includes a foil or a film-like structure. 19. The apparatus of claim 12, wherein the radiation attenuating material includes a powder mixed within said binding material, and wherein said mixture is applied onto at least one of said fibers. 20. The apparatus of claim 1, wherein the tiles are manufactured from a thermoplastic material mixed with a radiation attenuating material.