Φ100 mm级Ca∶Ce∶LYSO闪烁晶体生长及闪烁性能研究  

Growth and Scintillation Properties of Φ100 mm Ca∶Ce∶LYSO Crystal

作　　者：王佳[1] 岑伟[1] 丁雨憧[1] 王强 张泽涛 WANG Jia;CEN Wei;DING Yuchong;WANG Qiang;ZHANG Zetao(The 26th Insititute of China Electronics Technology Group Corporation, Chongqing 400060, China)

机构地区：[1]中国电子科技集团公司第二十六研究所,重庆400060

出　　处：《人工晶体学报》2021年第10期1946-1950,共5页Journal of Synthetic Crystals

摘　　要：为了满足具有飞行时间技术特点的正电子发射断层扫描仪(TOF-PET)对光输出高、衰减时间短以及上升时间快的Ce∶LYSO闪烁晶体的需要,本文采用中频感应提拉法生长Φ100 mm×100 mm级Ca∶Ce∶LYSO闪烁晶体。晶体整体无色透明、无包裹体。经过紫外可见分光光度计测试,晶体透过率接近理论值,质量较好。将晶体切割研磨抛光后,分别进行脉冲高度谱、衰减时间能谱等测试。在137Cs放射源激发下,Ca∶Ce∶LYSO晶体的光输出达到33962 ph/MeV,能量分辨率为8.6%,衰减时间达到36.70 ns,均优于Ce∶LYSO晶体。通过对晶体轴向及尾部径向取样,相对光输出和能量分辨率不均匀性分别为±2.4%、±9.4%及±1.18%、±6.8%,证明晶体具有较好的均匀性。In order to satisfy the requirement of the time-of-flight positron emission tomography(TOF-PET),the Ce∶LYSO scintillator should have higher light output,shorter decay time and faster rise time.The transparent and inclusions-free Ca∶Ce∶LYSO scintillation crystal with size of Φ100 mm×100 mm was successfully grown by frequency induction Czochralski method.The transmittance of the prepared crystal tested by UV-Vis spectrophotometer is close to the theoretical value,indicating its excellent quality.After cutting,grinding and polishing,the pulse height spectrum and decay time of the Ca∶Ce∶LYSO scintillation crystal were tested respectively.The measured light output,energy resolution and decay time are 33962 ph/MeV,8.6%,36.70 ns,respectively,which shows its superior scintillation properties than Ce∶LYSO.The inhomogeneity of relative light output and energy resolution of axial sampling are±2.4%and±9.4%,and those of the tail-radial sampling are±1.18%and±6.8%respectively,which proves the crystal has good uniformity.

关 键 词：Ca∶Ce∶LYSO 闪烁晶体 提拉法 晶体生长 闪烁性能 不均匀性 

分 类 号：O734[理学—晶体学]