Barium iodide and strontium iodide crystals and scintillators implementing the same

Patent metadata

Field	Value
Publication number	US-9441154-B2
Application number	US-201414220904-A
Country	US
Kind code	B2
Filing date	Mar 20, 2014
Priority date	Nov 16, 2007
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

In one embodiment, a crystal includes at least one metal halide; and an activator dopant comprising ytterbium. In another general embodiment, a scintillator optic includes: at least one metal halide doped with a plurality of activators, the plurality of activators comprising: a first activator comprising europium, and a second activator comprising ytterbium. In yet another general embodiment, a method for manufacturing a crystal suitable for use in a scintillator includes mixing one or more salts with a source of at least one dopant activator comprising ytterbium; heating the mixture above a melting point of the salt(s); and cooling the heated mixture to a temperature below the melting point of the salts. Additional materials, systems, and methods are presented.

First claim

What is claimed is:

1. A single crystal, comprising:
at least one metal halide, wherein the at least one metal halide comprises beryllium iodide;
an activator dopant comprising ytterbium, wherein the ytterbium is divalent; and
at least one compound selected from a group consisting of: a selenide, and a telluride.

2. The crystal of claim 1 , wherein the at least one metal halide further comprises an alkaline earth halide comprising a metal selected from a group consisting of strontium, barium and calcium.

3. The crystal of claim 2 , comprising:
at least one additional activator dopant, wherein the additional activator dopant comprises europium primarily in the form of Eu 2+ ;
wherein the activator dopant is present in an amount ranging from about 0.5 mol % to about 10.0 mol % and the additional activator dopant is present in an amount less than an amount in which the activator dopant is present;
wherein the one or more metal halides comprise:
magnesium iodide;
calcium iodide;
strontium iodide;
barium iodide;
lithium iodide;
sodium iodide;
potassium iodide;
rubidium iodide; and
cesium iodide; and

wherein the crystal has a volume of at least one cubic centimeter; and
wherein the crystal has at least one face with an area of at least approximately one square centimeter.

4. The crystal of claim 1 , wherein the crystal has a volume of at least one cubic centimeter.

5. The crystal of claim 1 , wherein the crystal has at least one face with an area of at least approximately one square centimeter.

6. The crystal of claim 1 , wherein the activator dopant is present in an amount ranging from about 0.5 mol % to about 10.0 mol %.

7. The crystal of claim 1 , further comprising at least one additional metal halide, wherein the additional metal halide is selected from a group consisting of a strontium chloride, a barium chloride and a calcium chloride.

8. The crystal of claim 1 , further comprising at least one additional activator dopant, wherein the additional activator dopant comprises europium primarily in the form of Eu 2+ .

9. The crystal of claim 8 , wherein the additional activator dopant is present in an amount less than an amount in which the activator dopant is present.

10. A scintillator optic, comprising:
at least one metal halide doped with a plurality of activators, the plurality of activators comprising a first activator and a second activator; and
at least one compound selected from a group consisting of: a selenide, and a telluride;
wherein the at least one metal halide comprises beryllium iodide and magnesium iodide;
wherein the first activator comprises divalent europium; and
wherein the second activator comprises divalent ytterbium.

11. A method for manufacturing a crystal suitable for use in a scintillator, the method comprising:
mixing one or more salts comprising beryllium iodide, magnesium iodide, and at least one of: a selenide and a telluride with a source of at least one dopant activator comprising divalent ytterbium;
heating the mixture above a melting point of the salts; and
cooling the heated mixture to a temperature below the melting point of the salts.

12. The method of claim 11 , wherein the one or more salts further comprise:
at least one metal cation; and
at least one anion selected from a group consisting of: a borate, a carbonate, a nitrate, a phosphate, and a sulfide.

13. The method of claim 11 , wherein the one or more salts further comprise at least one of:
calcium iodide;
strontium iodide;
barium iodide;
lithium iodide;
sodium iodide;
potassium iodide;
rubidium iodide; and
cesium iodide.

14. The method of claim 11 , wherein the at least one dopant activator further comprises europium present in an amount less than the ytterbium, wherein each of the europium and the ytterbium are primarily divalent.

15. The method of claim 11 , wherein the crystal is embodied as a single crystal having a volume of at least one cubic centimeter.

16. The method of claim 11 , wherein the crystal is embodied as a single crystal having at least one face with an area of at least approximately one square centimeter.

17. The scintillator optic of claim 10 ,
wherein the second activator is present in an amount ranging from about 0.5 mol % to about 10.0 mol % and the first activator is present in an amount less than an amount in which the second activator is present;
wherein the at least one metal halide further comprises: rubidium iodide; and
wherein the optic comprises at least one single crystal formed from the at least one metal halide;
wherein the at least one single crystal has a volume of at least one cubic centimeter; and
wherein the at least one single crystal has at least one face with an area of at least approximately one square centimeter.

Assignees

• L Livermore Nat Security Llc
• Fisk Univ

Inventors

• Payne Stephen A
• Cherepy Nerine
• Pedrini Christian
• Burger Arnold

Classifications

• C09K11/7772 Primary

  Halogenides (C09K11/7767 takes precedence) · CPC title

• C09K11/7733 Primary

  with alkali or alkaline earth metals · CPC title

• C30B11/00

  Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method (C30B13/00, C30B15/00, C30B17/00, C30B19/00 take precedence; under a protective fluid C30B27/00) · CPC title

• C30B29/12

  Halides · CPC title

• G01T1/202

  the detector being a crystal · CPC title