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US 7,180,068 B1Granted
Scintillation materials with reduced afterglow and method of preparation
AssigneeRadiation Monitoring Devices, Inc.
InventorsCharles Brecher, Vivek Nagarkar
Life of this patent
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Abstract
Scintillation materials of this invention have an alkali halide host material, a (first) scintillation dopant of various types, and a variety of second dopants (co-dopants). In another embodiment, the scintillation materials of this invention have an alkali halide host material, a (first) scintillation dopant of various types, a variety of second dopants (co-dopants), and a variety of third dopants (co-dopants). Co-dopants of this invention are capable of providing a second auxiliary luminescent cation dopant, capable of introducing an anion size and electronegativity mismatch, capable of introducing a mismatch of anion charge, or introducing a mismatch of cation charge in the host material.
Claims74
A scintillation material comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant;
- comprising a lanthanide series cation;
- and
- wherein the second dopant results in the scintillation material having substantially reduced afterglow.
4 more elements
A scintillation material comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant introducing a mismatch of cation charge in said host material;
- wherein the second dopant results in a scintillation material having substantially reduced afterglow.
2 more elements
A scintillation material comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant introducing an anion size and electronegativity mismatch in said host material;
- wherein the second dopant results in a scintillation material having substantially reduced afterglow.
2 more elements
A radiation detector comprising:
- a scintillator, said scintillator comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant;
- comprising a lanthanide series cation;
- wherein the second dopant results in the scintillator having substantially reduced afterglow;
- and,
- a photodetector, said photodetector receiving electromagnetic radiation emanating from said scintillator.
6 more elements
A radiation detector comprising:
- a scintillator, said scintillator comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant introducing a mismatch of cation charge in said host material;
- wherein the second dopant results in a scintillatior having substantially reduced afterglow;
- and,
- a photodetector, said photodetector receiving electromagnetic radiation emanating from said scintillator.
5 more elements
A radiation detector comprising:
- a scintillator comprising:
- a scintillator, said scintillator comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant introducing an anion size and electronegativity mismatch in said host material;
- wherein the second dopant results in a scintillator having substantially reduced afterglow;
- and,
- a photodetector, said photodetector receiving electromagnetic radiation emanating from said scintillator.
6 more elements
A penetrating radiation imaging/analysis device comprising:
- at least one radiation detector, said at least one radiation detector comprising:
- a scintillator, said scintillator comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and, dopant;
- comprising a lanthanide series cation;
- wherein the second dopant results in the scintillation material having substantially reduced afterglow;
- and,
- a photodetector, said photodetector receiving electromagnetic radiation emanating from said scintillator.
6 more elements
A penetrating radiation imaging/analysis device comprising:
- at least one radiation detector, said at least one radiation detector comprising:
- a scintillator, said scintillator comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant introducing a mismatch of cation charge in said host material;
- wherein the second dopant results in the scintillator having substantially reduced afterglow;
- and,
- a photodetector, said photodetector receiving electromagnetic radiation emanating from said scintillator.
6 more elements
A penetrating radiation imaging/analysis device comprising:
- at least one radiation detector, said at least one radiation detector comprising:
- a scintillator, said scintillator comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant introducing an anion size and electronegativity mismatch in said host material;
- wherein the second dopant results in the scintillator having substantially reduced afterglow;
- and,
- a photodetector, said photodetector receiving electromagnetic radiation emanating from said scintillator.
6 more elements
A scintillation material comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material, a molar concentration of said first dopant being less than about 10%;
- and,
- a second dopant capable of introducing an auxiliary luminescent cation dopant in said host material;
- said second dopant comprising a lanthanide series cation;
- wherein the second dopant results in the scintillation material having substantially reduced afterglow;
- a molar concentration of said second dopant being between substantially 0.1 to substantially 10%.
4 more elements
A scintillation material comprising:
- a cesium iodide host material;
- a first dopant comprising a thallium cation, a molar concentration of said first dopant being less than about 10%;
- and,
- a second dopant comprising europium;
- wherein the second dopant results in the scintillation material having substantially reduced afterglow;
- a molar concentration of said second dopant being between substantially 0.1% to substantially 10%.
3 more elements
A scintillation material comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant selected from the group consisting of a dopant capable of introducing an auxiliary luminescent cation in said host material, a dopant capable of introducing a mismatch of cation charge in said host material, and a dopant capable of introducing an anion size and electronegativity mismatch in said host material;
- wherein the second dopant results in the scintillation material having substantially reduced afterglow;
- a molar concentration of said second dopant being between substantially 0.1 to substantially 10%.
3 more elements
A scintillation material comprising:
- a cesium iodide host material;
- a first dopant comprising a thallium cation, a molar concentration of said first dopant being less than about 10%;
- a second dopant selected from the group consisting of a dopant capable of introducing an auxiliary luminescent cation in said host material, a dopant capable of introducing a mismatch of cation charge in said host material, and a dopant capable of introducing an anion size and electronegativity mismatch in said host material;
- wherein the second dopant results in the scintillation material having substantially reduced afterglow;
- a molar concentration of said second dopant being between substantially 0.1 to substantially 10%.
2 more elements
A scintillation material comprising:
- an alkali halide host material;
- a first dopant acting as a scintillation activator in said host material;
- and,
- a second dopant selected from the group consisting of a dopant capable of introducing an auxiliary luminescent cation in said host material, a dopant capable of introducing a mismatch of cation charge in said host material, and a dopant capable of introducing an anion size and electronegativity mismatch in said host material;
- wherein the second dopant results in the scintillation material having substantially reduced afterglow.
2 more elements
Dependencies are inferred from the claim text.