Patent Number: 
Section: claims

1. A method, comprising:placing into a crucible precursors including:a rare earth halide precursor; anda Ca halide precursor;melting the precursors to form a melt, wherein a concentration of the Ca halide is at least 0. 02wt. %;forming a scintillation crystal including Ln(1-y)REyX3:Ca, wherein:Ln represents a rare earth element;RE represents a different rare earth element;y has a value in a range of 0 to 1; andX represents a halogen; andoptically coupling an optical interface to the scintillation crystal. 2. The method of claim 1, wherein RE is Ce. 3. The method of claim 2, wherein Ln is La. 4. The method of claim 3, wherein X is Br. 5. The method of claim 2, wherein y is 1.0 f.u. 6. The method of claim 1, wherein the concentration of the Ca halide in the melt is no greater than 1.0 wt. %. 7. The method of claim 1, wherein y is no greater than 0.5 and at least 0. 005. 8. The method of claim 1, wherein y is in a range of 0.01 to 0.09. 9. The method of claim 1, wherein for a radiation energy range of 13 keV to 30 keV, the scintillation crystal has a PR dev average of no greater than 14%, or for a radiation energy range of 30 keV to 60 keV, the scintillation crystal has a PR dev average of no greater than 8.0%. 10. The method of claim 1, wherein:for a radiation energy range of 11 keV to 30 keV, the scintillation crystal has a PR dev average of no greater than 8.0%; orfor radiation energy range of 30 keV to 60 keV, the scintillation crystal has the PR dev average of no greater than 3.6%. 11. The method of claim 1, wherein an energy resolution ratio is an energy resolution of the scintillation crystal divided by a different energy resolution of a different scintillation crystal of a different composition, wherein the energy resolution ratio is:no greater than 0.95 for an energy of 8 keV;no greater than 0.95 for an energy of 13 keV;no greater than 0.95 for an energy of 17 keV;no greater than 0.95 for an energy of 22 keV;no greater than 0.95 for an energy of 26 keV;no greater than 0.95 for an energy of 32 keV; orno greater than 0.97 for an energy of 44 keV. 12. The method of claim 11, wherein the energy resolution ratio is no greater than 0.95 for the energy of 8 keV. 13. The method of claim 11, wherein the energy resolution ratio is no greater than 0.95 for the energy of 13 keV. 14. The method of claim 11, wherein the energy resolution ratio is no greater than 0.95 for the energy of 17 keV. 15. The method of claim 11, wherein the energy resolution ratio is no greater than 0.95 for the energy of 22 keV. 16. The method of claim 11, wherein the energy resolution ratio is no greater than 0.95 for the energy of 26 keV. 17. The method of claim 11, wherein an energy resolution ratio is no greater than 0.95 for the energy of 32 keV. 18. The method of claim 1, further comprising optically coupling a photosensor to the optical interface.