Patent Number: 
Section: claims

1. An inorganic scintillator having the formula:SryBazCsX5:Ln1x(IIa); wherein X is Br, CI, I, or a mixture thereof; Ln1 is a lanthanide with a valence of 2+; x has a value having the range 0<x<2; y has a value having the range 0<y<2; z has a value having the range 0≤z<2; y+z>0; and, x+y+z=2. 2. The inorganic scintillator of claim 1, wherein X is Br. 3. The inorganic scintillator of claim 1, wherein X is Cl. 4. The inorganic scintillator of claim 1, wherein X is I. 5. The inorganic scintillator of claim 1, wherein Ln′ is Eu or Yb. 6. The inorganic scintillator of claim 1, wherein y has a value of 0, and z has a value having the range 0<z<2. 7. The inorganic scintillator of claim 1, wherein x has a value having the range 0<z<0.2. 8. The inorganic scintillator of claim 7, wherein x has a value having the range 0.02x<0.2. 9. The inorganic scintillator of claim 1, wherein the inorganic scintillator is a single crystal having at least one dimension of a length of at least 1 mm, or a length at least sufficient to stop or absorb gamma-radiation. 10. A gamma ray detector comprising the inorganic scintillator of claim 9. 11. An inorganic scintillator having the formula: MmCsX5:Ln1x (IIe); wherein M is Sr; X is Br, CI, I, or a mixture thereof; Ln1 is a lanthanide with a valence of 2+; x has a value having the range 0<x<2; m has a value having the range 0<m<2; and, x+m=2. 12. The inorganic scintillator of claim 11, wherein X is Br. 13. The inorganic scintillator of claim 11, wherein X is Cl. 14. The inorganic scintillator of claim 11, wherein X is I. 15. The inorganic scintillator of claim 11, wherein Ln1 is Eu or Yb. 16. The inorganic scintillator of claim 11, wherein x has a value having the range 0<x<0.2. 17. The inorganic scintillator of claim 16, wherein x has a value having the range 0.02x<0.2. 18. The inorganic scintillator of claim 11, wherein the inorganic scintillator is a single crystal having at least one dimension of a length of at least 1 mm, or a length at least sufficient to stop or absorb gamma-radiation. 19. A gamma ray detector comprising the inorganic scintillator of claim 18. 20. An inorganic scintillator having the formula: MmCsX5:Ln1x (IIe); wherein M is Ba; X is CI or I, or a mixture of Br, CI, and/or I; Ln1 is a lanthanide with a valence of 2+; x has a value having the range 0<x<2; m has a value having the range 0<m<2; and, x+m=2. 21. The inorganic scintillator of claim 20, wherein X is Cl. 22. The inorganic scintillator of claim 20, wherein X is I. 23. The inorganic scintillator of claim 20, wherein Ln1 is Eu or Yb. 24. The inorganic scintillator of claim 20, wherein x has a value having the range 0<x<0.2. 25. The inorganic scintillator of claim 24, wherein x has a value having the range 0.02x<0.2. 26. The inorganic scintillator of claim 20, wherein the inorganic scintillator is a single crystal having at least one dimension of a length of at least 1 mm, or a length at least sufficient to stop or absorb gamma-radiation. 27. A gamma ray detector comprising the inorganic scintillator of claim 26. 28. An inorganic scintillator having the formula: MmCsX5:Ln1x (IIe); wherein M is Ba; X is Br; Ln1 is a lanthanide with a valence of 2+; x has a value having the range 0.02x<0.2; m has a value having the range 0<m<2; and, x+m=2. 29. The inorganic scintillator of claim 28, wherein Ln1 is Eu or Yb. 30. The inorganic scintillator of claim 28, wherein the inorganic scintillator is a single crystal having at least one dimension of a length of at least 1 mm, or a length at least sufficient to stop or absorb gamma-radiation. 31. A gamma ray detector comprising the inorganic scintillator of claim 30.