Patent Number: 
Section: claims

1. An inorganic scintillator having the formula: Ba1-yX1xX22-x:Ln1y (VIf); wherein X1 is CI, Br, or I, X2 is CI, Br, or I, X1 and X2 are not the same halogen element, Ln1 is a lanthanide with a valence of 2+, x has a value having the range 0.1≤x<2, and y has a value having the range 0<y≤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. 2. The inorganic scintillator of claim 1, wherein y has a value having the range 0.001≤y≤1. 3. The inorganic scintillator of claim 2, wherein y has a value having the range 0.01≤y≤1. 4. The inorganic scintillator of claim 3, wherein y has a value having the range 0.1≤y≤1. 5. The inorganic scintillator of claim 2, wherein y has a value having the range 0.001≤y≤0.5. 6. The inorganic scintillator of claim 5, wherein y has a value having the range 0.01≤y≤0.5. 7. The inorganic scintillator of claim 6, wherein y has a value having the range 0.1≤y≤0.5. 8. The inorganic scintillator of claim 1, wherein the Ln1 is Eu2+. 9. The inorganic scintillator of claim 1, wherein the X1 is Br, and X2 is I or Cl. 10. The inorganic scintillator of claim 9, wherein the X1 is Br, and X2 is Cl. 11. The inorganic scintillator of claim 9, wherein the X1 is Br, and X2 is I. 12. The inorganic scintillator of claim 10, wherein Ln1 is Eu2+. 13. The inorganic scintillator of claim 12, wherein x has a value having the range 0.3≤x≤1.7. 14. The inorganic scintillator of claim 13, wherein x has a value having the range 0.5≤x≤1.5. 15. The inorganic scintillator of claim 14, wherein x has a value having the range 0.7≤x≤1.3. 16. The inorganic scintillator of claim 15, wherein x has a value having the range 0.9≤x≤1.1. 17. The inorganic scintillator of claim 16, wherein x is 1. 18. A gamma ray detector comprising the inorganic scintillator of claim 1.