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US 7,923,708 B2Granted
Radiation shielding sheet
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorEiji Oyaizu
Life of this patent
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Abstract
A radiation shielding sheet formed by filling a shielding material into an organic polymer material. The shielding material is an oxide powder containing at least one element selected from the group consisting of lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu) and gadolinium (Gd). The oxide powder has an average grain size of 1 to 20 μm, and a volumetric ratio of the shielding material filled in the radiation shielding sheet is 40 to 80 vol. %.
Claims13
A radiation shielding sheet comprising:
- a shielding material mixed with an organic polymer material,
- wherein said shielding material is an oxide powder containing at least one element selected from the group consisting of lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu) and gadolinium (Gd), said oxide powder having an average grain size of 1 to 20 μm, and
- wherein a volumetric ratio of the shielding material in said radiation shielding sheet is 40 to 80 vol. %.
A radiation shielding sheet comprising:
- an organic polymer material;
- and
- a shielding material mixed with said organic polymer material,
- wherein said shielding material is an oxide powder of a single substance of metal element or metal compound, and has a composition containing lanthanum (La) and cerium (Ce), and
- wherein the metal compound powder has a composition containing 10 to 40 mass % of lanthanum (La) oxide and 30 to 60 mass % of cerium (Ce) oxide.
2 more elements
Dependencies are inferred from the claim text.