Method of producing double-doped scintillation crystal

A method of producing a double-doped scintillation crystal, comprising steps of:

• (A) growing a double-doped single crystal boule by Czochralski method, wherein said double-doped single crystal boule has a diameter of 70 mm and a length of 200 mm, said double-doped single crystal boule is a single crystal boule having general formula (I) or (II), and tetravalent cerium (Ce4+) become trivalent cerium (Ce3+) by charge compensation,
• Cax+Cey:Lu2−x−y−zYzSiO5 (I)
• Mgx+Cey:Lu2−x−y−zYzSiO5 (II)
• in the general formula (I) and (II), x is 0.003, y is more than 0.001 to less than 0.1, and z is equal to or greater than 0.05 to less than 1.898;
• and
• (B) performing a thermal annealing process by placing the double-doped single crystal boule in a furnace, so as to form said double-doped scintillation crystal boule, wherein said thermal annealing process comprises:
• a heating step, wherein the double-doped single crystal boule is heated from a room temperature to a temperature of 1400° C. ˜1600° C. in 480 minutes (mins)˜600 mins;
• a temperature-sustaining step, wherein said temperature is maintained at 1400° C. ˜1600° C. for 50 hours (hrs)˜200 hrs and
• a cooling step, wherein said double-doped single crystal boule is cooled down from 1400° C.˜1600° C. to a room temperature in 480 mins ˜720 mins.