Patent ID: 7812322

Claim:
A radiation-shielding assembly for radioactive material, the assembly comprising: a body having a cavity defined therein for receiving radioactive material, the body having first and second openings into the cavity, the first opening being sized smaller than the second opening, and the body being constructed to limit escape of radiation from the cavity through the body; a first base releasably attachable to the body generally at the second opening thereof; and a second base releasably attachable to the body generally at the second opening thereof when the first base is not releasably attached to the body, wherein the first base has a length and a weight, and wherein the second base has at least one of a shorter length and a lighter weight than the first base; the first base including first and second closure surfaces, wherein the first base is releasably attachable to the body in a first orientation in which the first closure surface is positioned generally at the second opening and faces inward of the cavity at a first distance from the first opening, and wherein the first base is releasably attachable to the body in a second orientation in which the second closure surface is positioned generally at the second opening and faces inward of the cavity at a second distance from the first opening, the first distance being different from the second distance.