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.
作者
王佳
岑伟
丁雨憧
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)
出处
《人工晶体学报》
CAS
北大核心
2021年第10期1946-1950,共5页
Journal of Synthetic Crystals
作者简介
王佳(1981—),女,黑龙江省人,高级工程师,硕士,中国电子科技集团公司第二十六研究所高级工程师,主要研究方向为晶体生长技术,承担总装备部、国防科工局、工信部、国资委、重庆市以及企事业单位等科技项目,开展了铌酸锂、硅酸铋、锗酸铋、蓝宝石、钇铝石榴石、掺钛蓝宝石、掺铈硅酸钇镥等晶体生长,以及晶体关键性能辅助提升技术开发等工作,曾获重庆市科技进步三等奖(3)、中国电子科技集团公司科技进步奖三等奖(1)等,制定国家和行业标准多项,E-mail:jiawang1224@163.com。
