Method for growing strontium iodide scintillating crystals by nonvacuum Bridgman method
A technology of crucible drop method and scintillation crystal, which is applied in the field of preparation of pure strontium iodide and europium ion-doped strontium iodide crystals grown by deoxidizer method, can solve complex operation, low expansion coefficient, and variable energy resolution at the end of crystal growth. To achieve the effect of simple operation and low cost
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Embodiment 1
[0018] Growth Φ25×200mm 3 The specific process steps of the strontium iodide scintillation crystal are:
[0019] 1) select commercially available carbon powder as deoxidizer and commercially available 99.9% strontium iodide and europium iodide powder as raw materials, weigh strontium iodide, europium iodide and carbon powder, the addition of carbon powder is 1%, Europium iodide: strontium iodide=5%, the weighed raw materials were evenly mixed, and the whole operation process was operated in a glove box with a water content lower than 10ppm.
[0020] 2) Place the strontium iodide seed crystals at the bottom of a cylindrical platinum crucible, then put in the mixed raw materials, and seal the crucible. The wall thickness of the crucible is 0.10 mm.
[0021] 3) Put the crucible prepared in step 2) into the crystal growth furnace. The contact part between the seed crystal and the raw material is in the middle of the temperature gradient area to ensure that the seed crystal is not...
Embodiment 2
[0026] Growth Φ50×200mm 3 The specific process steps of the strontium iodide scintillation crystal are:
[0027] 1) select commercially available carbon powder as deoxidizer and commercially available 99.9% strontium iodide and europium iodide powder as raw materials, weigh strontium iodide, europium iodide and carbon powder, the addition of carbon powder is 0.01%, Europium iodide: strontium iodide=5%, the weighed raw materials were evenly mixed, and the whole operation process was operated in a glove box with a water content lower than 10ppm.
[0028] 2) Place the strontium iodide seed crystals at the bottom of a cylindrical platinum crucible, then put in the mixed raw materials, and seal the crucible. The wall thickness of the crucible is 1 mm.
[0029] 3) Put the crucible prepared in step 2) into the crystal growth furnace, the contact part between the seed crystal and the raw material is in the middle of the temperature gradient area, so as to ensure that the seed crystal...
Embodiment 3
[0033] Growth Φ50×200mm 3 The specific process steps of pure strontium iodide scintillation crystal are:
[0034] 1) Select commercially available carbon powder as a deoxidizer and commercially available 99.9% strontium iodide and europium iodide powder as raw materials, weigh strontium iodide and carbon powder, the addition of carbon powder is 0.5%, and weigh the The raw materials are mixed evenly, and the whole operation process is operated in a glove box with a water content of less than 10ppm.
[0035] 2) Put the mixed raw materials into the crucible, and seal the crucible, the wall thickness of the crucible is 1mm.
[0036]3) Put the crucible prepared in step 2) into the crystal growth furnace. The bottom of the crucible is in the middle of the temperature gradient zone. Raise the temperature to 560°C and keep the temperature constant for 5 hours. The temperature gradient in the temperature gradient zone is 30°C / h to ensure that the crucible All the raw materials are me...
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