Doped cadmium tungstate scintillator with improved radiation hardness
AssigneeIntematix Corporation
InventorsShifan Cheng, Yi-Qun Li
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Abstract
This invention provides novel cadmium tungstate scintillator materials that show improved radiation hardness. In particular, it was discovered that doping of cadmium tungstate (CdWO4) with trivalent metal ions or monovalent metal ions is particularly effective in improving radiation hardness of the scintillator material.
Claims20
A sintered body comprising a scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, the scintillator composition being a component of the sintered body, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4.
A scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4;
- and,
- wherein the doped cadmium tungstate is represented by the formula:
- Cd(1−(x+y))AxByWO4
- where:
- A is a monovalent metal ion selected from the group consisting of:
- Li, Na, K, Rb, Cs, Ag, Tl, and combinations thereof;
- B is a trivalent metal ion selected from the group consisting of:
- Bi, Y, La, Ce, Pr, Nd, Gd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, and combinations thereof;
- wherein X is about 0.005;
- and,
- Y ranges from 0 to about 0.01.
A scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4;
- and,
- wherein the doped cadmium tungstate is represented by the formula:
- Cd(1−(x+y))AxByWO4
- where:
- A is a monovalent metal ion selected from the group consisting of:
- Li, Na, K, Rb, Cs, Ag, Tl, and combinations thereof:
- B is a trivalent metal ion selected from the group consisting of:
- Bi, Y, La, Ce, Pr, Nd, Gd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, and combinations thereof;
- wherein X is about 0.001;
- and
- Y ranges from 0 to about 0.01.
A scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4;
- and,
- wherein the doped cadmium tungstate is represented by the formula:
- Cd(1−(x+y))AxByWO4
- where:
- A is a monovalent metal ion selected from the group consisting of:
- Li, Na, K, Rb, Cs, Ag, Tl, and combinations thereof;
- B is a trivalent metal ion selected from the group consisting of:
- Bi, Y, La, Ce, Pr, Nd, Gd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, and combinations thereof;
- wherein X is about 0.001 or about 0.005;
- and,
- wherein Y is 0.
A scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4;
- and,
- wherein the doped cadmium tungstate is represented by the formula:
- Cd(1−(x+y))AxByWO4
- where:
- A is a monovalent metal ion selected from the group consisting of:
- Li, Na, K, Rb, Cs, Ag, Tl, and combinations thereof;
- wherein X ranges from 0 to about 0.01;
- and,
- B is Gd3+ and Y ranges from about 0.0002 to about 0.001.
A scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4;
- and,
- wherein the doped cadmium tungstate is represented by the formula:
- Cd(1−(x+y))AxByWO4
- where:
- A is a monovalent metal ion selected from the group consisting of:
- Li, Na, K, Rb, Cs, Ag, Tl, and combinations thereof;
- B is a trivalent metal ion selected from the group consisting of:
- Bi, Y, La, Ce, Pr, Nd, Gd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, and combinations thereof;
- wherein X and Y are both 0.01 or less;
- and,
- wherein X and Y are both greater than zero.
A scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4;
- and,
- wherein the doped cadmium tungstate is represented by the formula:
- Cd(1−(x+y))AxByWO4
- where:
- A is a monovalent metal ion selected from the group consisting of:
- Li, Na, K, Rb, Cs, Ag, Tl, and combinations thereof;
- B is a trivalent metal ion selected from the group consisting of:
- Bi, Y, La, Ce, Pr, Nd, Gd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, and combinations thereof;
- wherein X ranges from greater than zero to about 0.01, and Y is zero.
A scintillator composition comprising a cadmium tungstate doped with a monovalent metal ion and/or a trivalent metal ion, wherein said scintillator composition shows higher radiation tolerance than undoped CdWO4;
- and,
- wherein the doped cadmium tungstate is represented by the formula:
- Cd(1−(x+y))AxByWO4
- where:
- A is a monovalent metal ion selected from the group consisting of:
- Na, K and combinations thereof;
- B is a trivalent metal ion selected from the group consisting of:
- Bi, Gd, and combinations thereof;
- wherein said doped cadmium tungstate is selected from the group consisting of Cd0.9995Na0.0005WO4, Cd0.9995Gd0.0005WO4, and Cd0.999(KBi)0.001WO4.
Dependencies are inferred from the claim text.