METHOD OF PRODUCING DOUBLE-DOPED SCINTILLATION CRYSTAL

摘要

A method of producing a double-doped scintillation crystal is provided. Czochralski method is used to grow a double-doped single crystal boule. The double-doped single crystal boule is a single crystal boule of rare-earth silicate double-doped with cerium (Ce) and calcium (Ca) or magnesium (Mg). The double-doped single crystal boule is subjected to a thermal annealing process in a furnace. A yield of pixel samples of the double-doped scintillation crystal is improved after a processing process, and the present invention achieves low producing cost, high yield, less crystal fragmentations, high luminescence intensity and short decaying time.

主权项

1. A method of producing a double-doped scintillation crystal, comprising steps of:
(A) growing a double-doubled single crystal boule by Czochralski method, wherein said double-doped single crystal boule is a single crystal boule of rare-earth silicate doped with cerium (Ce) and an element selected from the group consisting of calcium (Ca) and magnesium (Mg), and said element makes tetravalent cerium (Ce4+) become trivalent cerium (Ce3+) by charge compensation; 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)˜720 mins;a temperature-sustaining step, wherein said temperature is maintained at 1400° C.˜1600° C. for 50 hours (hrs)˜200 hrs anda 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.