Patent Number: 
Section: claims

1. A radiation-shielding assembly for a container having a radioactive material disposed therein, the assembly comprising:a body comprising a sidewall at least partially defining a cavity, the body defining an opening into the cavity, the body also comprising radiation shielding material;a cap adapted for releasable attachment to the body when the cap is in a first orientation relative to the body and for non-attached engagement with the body when the cap is in a second orientation relative to the body, radiation shielding material of the cap closing the opening in both the first orientation and in the second orientation;the cap including a magnetic portion operable to attract the base when the cap is in the first orientation, the cap being constructed to inhibit magnetic attraction of the cap to the base in the second orientation; andthe cap being operable to inhibit escape of radiation from the cavity of the assembly through the opening when the cap is adjacent the opening in the first orientation and in the second orientation. 2. The assembly of claim 1, wherein the opening is a first opening, the first opening being adjacent a first end of the body, the body defining a second opening adjacent a second end of the body, the first opening being of a first size, the second opening being of a second size greater than the first size, the assembly further comprising a base releasably attached to the body adjacent the second opening, the base comprising a base shielding element operable to limit escape of radiation from the assembly through the second opening when the base is attached to the body. 3. The assembly of claim 1, wherein the body comprises a top part and a bottom part removably interconnected with the top part, the bottom part having a closed end and an open end, the open end having an opening of a first size, the top part defining the opening of the body, the opening of the body being of a second size smaller than the first size, the top part being removable from the bottom part for loading and unloading a container into the cavity. 4. The assembly of claim 1, wherein the cap is adapted to be placed on a flat surface and to support the body above the surface when the cap is in the second orientation. 5. The assembly of claim 1, wherein the cap comprises at least one of a radiation absorbing material and a radiation reflecting material. 6. Use of the radiation-shielding assembly of claim 1 in eluting a radioisotope from a radioisotope generator. 7. The assembly of claim 1, wherein when the cap is in the second orientation, the attraction of the magnetic portion of the cap to the body is sufficiently attenuated so that a weight of the cap is sufficient to separate the cap from the body when one of the body and the cap is urged away from the other. 8. A method of using a radiation-shielding assembly, the method comprising:placing a container in a body of the radiation-shielding assembly, wherein the body comprises radiation shielding material;loading radioactive material into the container through a needle inserted into the container, the loading occurring while the container is in the body of the radiation-shielding assembly;releasably attaching a cap of the radiation-shielding assembly while the cap is in a first orientation relative to the body, wherein the releasably attaching is due, at least in part, to magnetic attraction between the cap and the body when the cap is in a first orientation, and wherein the releaseably attaching comprises closing an opening in the body of the radiation-shielding assembly with radiation shielding material of the cap;detaching the cap from the body after the releasably attaching, wherein the detaching comprises uncovering the opening;removing a radioactive material from within the body through the opening thereof while the opening is uncovered;non-attachedly engaging the body and the cap while the cap is in a second orientation relative to the body, wherein there is a substantial decrease in magnetic attraction between the cap and the body when the cap is in the second orientation than when the cap is in the first orientation, and wherein the non-attachedly engaging comprises closing the opening in the body of the radiation-shielding assembly with radiation shielding material of the cap to inhibit escape of radiation through the opening; anddisengaging the body and the cap to uncover the opening after the non-attachedly engaging. 9. The method of claim 8, wherein the loading comprises receiving a radioisotope from a radioisotope generator. 10. The method of claim 8, further comprising:transporting the body containing the container loaded with radioactive material from a first location to a second location while the cap is attached to the body in the first orientation. 11. The method of claim 10, wherein the first location is adjacent a radioisotope generator and the second location is adjacent a calibration system.