Patent Number: 
Section: claims

1. A scintillation crystal comprising NaX:Tl, Me, wherein:X represents a halogen;Me represents a Group 1 element, a Group 2 element, or any combination thereof;Tl has a dopant concentration in a range of 1×10−5 mol % to 0.2 mol %; andMe has a dopant concentration greater than the dopant concentration of Tl; andthe scintillation crystal has a property including:an energy resolution less than 6.4% when measured at 662 keV, 22° C., and an integration time of 1 microsecond; ora pulse decay time that is less than another scintillation crystal that has a composition of NaX:Tl. 2. The scintillation crystal of claim 1, wherein Me represents a Group 1 element and has a concentration in a range of 1×10−5 mol % to 9 mol %. 3. The scintillation crystal of claim 2, wherein Me is Rb, Cs, or any combination thereof. 4. The scintillation crystal of claim 1, wherein X is I. 5. A method comprising;providing the scintillation crystal of claim 1;capturing radiation within the scintillation crystal;determining a pulse decay time and an actual light yield of the radiation captured;determining an estimated light yield corresponding to the pulse decay time; andcalculating an adjusted light yield that is a product of the actual light yield times the light yield of NaX:Tl divided by the estimated light yield. 6. A scintillation crystal comprising NaX:Tl, Sr, wherein:X represents a halogen; andTl has a dopant concentration in a range of 1×10−5 mol % to 0.2 mol %; andSr has a dopant concentration greater than a dopant concentration of Tl; andthe scintillation crystal has a pulse decay time that is at least 5% less than a pulse decay time a NaI:Tl crystal when the scintillation crystal and the NaI:Tl crystal are measured at 22° C. and exposed to gamma radiation having an energy of 662 keV. 7. The scintillation crystal of claim 6, wherein Sr has a concentration no greater than 0.9 mol %. 8. The scintillation crystal of claim 6, wherein the scintillation crystal has a greater light yield as compared to a NaI:Tl crystal when the scintillation crystal and the NaI:Tl crystal are measured at 22° C. 9. The scintillation crystal of claim 6, wherein the scintillation crystal has an energy resolution less than 6.4% when measured at 662 keV, 22° C., and an integration time of 1 microsecond. 10. The scintillation crystal of claim 6, wherein Sr has a concentration in a range of 0.01 mol % to 0.2 mol %. 11. The scintillation crystal of claim 6, wherein at energies in the range of 32 keV to 81 keV, the scintillation crystal has an average relative light yield as normalized to a light yield at 2615 keV of no greater than 1.15. 12. The scintillation crystal of claim 6, wherein at energies in the range of 122 keV to 511 keV, the scintillation crystal has an average relative light yield as normalized to a light yield at 2615 keV no greater than 1.07. 13. The scintillation crystal of claim 6, wherein Tl has a concentration in a range of 1×10−4 mol % to 0.15 mol %. 14. A scintillation crystal comprising NaX:Tl, Ca, wherein:X represents a halogen;Tl has a concentration of at least 1×10−5 mol %;a ratio of Ca:Tl is in a range of 1.5 to 7.0; andthe scintillation crystal has a pulse decay time that is at least 5% less than a pulse decay time of a NaI:Tl crystal when the scintillation crystal and the NaI:Tl crystal are measured at 22° C. and exposed to gamma radiation having an energy of 662 keV. 15. The scintillation crystal of claim 14, wherein Ca has a concentration no greater than 5 mol %. 16. The scintillation crystal of claim 14, wherein the scintillation crystal has an energy resolution less than 6.4% when measured at 662 keV, 22° C., and an integration time of 1 microsecond. 17. The scintillation crystal of claim 14, wherein at energies in the range of 32 keV to 81 keV, the scintillation crystal has an average relative light yield as normalized to a light yield at 2615 keV of no greater than 1.15. 18. The scintillation crystal of claim 14, wherein at energies in the range of 122 keV to 511 keV, the scintillation crystal has an average relative light yield as normalized to a light yield at 2615 keV no greater than 1.07. 19. The scintillation crystal of claim 14, wherein Ca has a concentration in a range of 0.01 mol % to 0.9 mol %. 20. The scintillation crystal of claim 19, wherein Tl has a concentration in a range of 1×10−4 mol % to 0.2 mol %.