Chemically bonded ceramic radiation shielding material and method of preparation
AssigneeCo-Operations, Inc.
InventorsJudd Hamilton, Vernon D. Hamilton
Life of this patent
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Abstract
A composition of matter and method of forming a radiation shielding member at ambient temperatures in which the composition of matter includes a ‘cold-fired’ chemically bonded oxide-phosphate ceramic cement matrix; with one or more suitably prepared and distributed radiation shielding materials dispersed in the ‘cold-fired’ chemically bonded oxide-phosphate ceramic cement matrix.
Claims28
A composition of matter comprising:
- a chemically bonded oxide-phosphate based ceramic matrix;
- and
- a radiation shielding material, wherein the radiation shielding material is dispersed
- in the chemically bonded oxide-phosphate based ceramic matrix in an amount of 40%-75% by weight and the radiation shielding material is selected from the group consisting of barium oxide, barium sulfate, cerium oxide, tungsten, tungsten oxide, gadolinium, gadolinium oxide, depleted uranium oxide, wherein the oxide-phosphate based ceramic matrix is MgHPO4⋅3H2O (magnesium hydrogen phosphate trihydrate), or wherein the oxide-phosphate ceramic matrix includes at least two different metal phosphates.
A method of constructing chemically bonded oxide-phosphate based ceramic matrix radiation shielding at ambient temperature, comprising:
- providing a mixture of
- (a) magnesium oxide, or at least two a metal oxides selected from the group consisting aluminum oxide, magnesium oxide, iron(III) oxide;
- iron (II) oxide and calcium oxide;
- (b) a phosphate containing material;
- (c) a radiation shielding material selected from the group consisting of barium oxide, barium sulfate, cerium oxide, tungsten oxide, tungsten, gadolinium oxide, gadolinium, depleted uranium oxide;
- and
- (d) a sparsely soluble silicate selected from the group consisting of calcium silicate (CaSiO3), magnesium silicate (MgSiO3), barium silicate (BaSiO3), sodium silicate (NaSiO3), lithium silicate (LaSiO3), and serpentinite
- (Mg64.O10.{OH8});
- adding an activator to the mixture;
- and
- allowing the mixture of the radiation shielding material, metal oxide, phosphate containing material in an amount of 40% -75% by weight and the sparsely soluble silicate to cure at ambient temperature.
A mixture comprising:
- magnesium oxide, or at least two metal oxides selected from the group consisting of magnesium oxide, iron (III) oxide;
- iron (II) oxide and calcium oxide;
- a phosphate-containing material;
- a radiation shielding material selected from the group consisting of:
- barium oxide, barium sulfate, cerium oxide, tungsten, tungsten oxide, gadolinium, gadolinium oxide, and depleted uranium oxide;
- wherein the radiation shielding material is in an amount of 40%-75% by weight;
- and a sparsely soluble silicate selected from the group consisting of calcium silicate (CaSiO3), magnesium silicate (MgSiO3), barium silicate (BaSiO3), sodium silicate (NaSiO3), lithium silicate (LaSiO3), and serpentinite (Mg64.O10.{OH8});
- wherein the composition forms a chemically bonded oxide phosphate ceramic matrix upon activation.
A radiation-shielding composition, comprising:
- (1) a chemically bonded ceramic matrix, comprising:
- a) magnesium phosphate;
- and
- b) wollastonite;
- and
- (2) a radiation-shielding material in an amount of 40% to 75% dispersed in the chemically bonded ceramic matrix.
A method of constructing a radiation shielding member, comprising:
- (1) forming a mixture comprising:
- (a) MgO (magnesium oxide);
- (b) KH2PO4 (monopotassium phosphate);
- (c) wollastonite;
- and
- (d) a radiation-shielding material in an amount of 40% to 75%;
- and
- (2) curing the mixture to provide a chemically bonded ceramic matrix of MgHPO4⋅3H2O (magnesium hydrogen phosphate trihydrate) and wollastonite with the radiation-shielding material dispersed therein.
Dependencies are inferred from the claim text.