Patent ID: 7335902

Claim:
A radiation shielded container for storing radioactive material comprising: an outer jacket portion; an inner lining portion, wherein the inner lining portion is positioned relative to the outer jacket portion to form a substantially uniform void between the inner lining portion and the outer jacket portion; a waste storage compartment defined by the inner lining portion; a radiation shielding polymer layer located within the void between the inner lining portion and the outer jacket portion; and wherein said radiation shielding polymer layer is formed from a composition comprising: about 1.2 to 15% by weight of at least one isocyanate monomer; about 1.0 to 14% by weight of at least one phenolic resin; about 0.2 to 1.0% by weight of a halogenated phosphate ester flame retardant compound; about 80 to 96% by weight of depleted uranium; and about 0 to 1.0% by weight of at least one catalyst.