Patent Number: 
Section: claims

1. An apparatus for providing additional radiation shielding to a container holding radioactive materials comprising:a tubular shell extending from a first end to a second end, the tubular shell constructed of a gamma radiation absorbing material and having an inner surface that forms a cavity;a first opening in the first end of the tubular shell that provides a passageway into the cavity;a second opening in the second end of the tubular shell that provides a passageway into the cavity, the second opening being larger than the first opening; anda plurality of spacers extending from the inner surface of the shell. 2. The apparatus of claim 1 wherein the spacers are circumferentially spaced from one another about an axis of the cavity. 3. The apparatus of claim 1 further comprising means on the first end of the tubular shell for lifting the apparatus. 4. The apparatus of claim 1 further comprising one or more channels that extend from along the inner surface of the tubular shell from the first end of the tubular shell to the second end of the tubular shell. 5. An apparatus for providing additional radiation shielding to a container holding radioactive materials comprising:a tubular shell constructed of a gamma radiation absorbing material and having an inner surface that forms a cavity having an axis, the cavity having an open top end and an open bottom end;a plurality of spacers extending from the inner surface of the shell toward the axis of the cavity, the spacers extending a first height from the inner surface of the tubular shell; andone or more flange members located at or near the open top end of the cavity extending from the tubular shell toward the axis of the cavity, the flange member extending a second height from the inner surface of the shell, the second height being greater than the first height. 6. The system of claim 5 further comprising one or more channels extending from the open bottom end of the cavity to the open top end of the cavity. 7. The system of claim 6 further comprising a ring-like member connected to a top of the tubular shell. 8. A system for handling and/or processing radioactive materials comprising:a container having a first cavity, the container having an outer surface and a top surface;a canister containing radioactive materials positioned within the first cavity;a tubular shell having an inner surface that forms a second cavity for receiving the container, the tubular shell comprising at least one spacer extending from the inner surface of the shell toward an axis of the second cavity;the container positioned in the second cavity of the tubular shell, the at least one spacer maintaining the inside surface of the tubular shell in a spaced relationship from the outer surface of the container; andwherein the tubular structure is non-unitary and slidably removable from the container. 9. The system of claim 8 wherein the second cavity of the tubular shell has an open top end defined by a first opening and an open bottom end defined by a second opening. 10. The system of claim 9 wherein the second opening is sized and shaped to allow a body portion of the container to slidably pass therethrough in an unobstructed manner. 11. The system of claim 10 wherein the container further comprises a lid positioned atop the body portion of the container that substantially encloses a top end of the first cavity; and wherein the first opening is sized and shaped to allow the lid to slidably pass therethrough in an unobstructed manner. 12. The system of claim 11 wherein the at least one spacer maintains the inside surface of the tubular shell in the spaced relationship from the outer surface of the container so as to form an annular gap between the tubular shell and the container. 13. The system of claim 12 wherein the annular gap comprises one or more channels that extend from an inlet at or near a bottom of the tubular shell to an outlet at or near a top of the tubular shell. 14. The system of claim 8 wherein the container comprises both gamma radiation absorbing material and neutron absorbing material and the tubular shell is constructed of a gamma radiation absorbing material.