Yb:YAG晶体性能实验测量

发布时间：2018-01-19 22:59

本文关键词： 时间宽度 Yb YAG晶体衰减时间发光光谱相对发光效率空间分辨　出处：《强激光与粒子束》2017年08期 　论文类型：期刊论文

【摘要】：为了测量脉冲时间宽度小于20ns时的γ射线时间分辨图像,发展了新型无机闪烁体Yb:YAG,并实验测量了晶体的发光衰减时间、X射线激发发光光谱、相对发光效率和空间分辨等性能,研究了Yb:YAG晶体的发光性能。实验表明,Yb:YAG发光有三种衰减成分,快成分衰减常数为1.2ns,慢成分衰减常数与射线种类有关;X射线激发发光光谱在250~800nm范围,有三个发光峰,分别为320,380和500nm,且320nm处强度最大;相对发光效率为1900ph/MeV;使用钨分辨卡测得Yb:YAG空间分辨能力为2lp/m,使用刀口法测得空间调制传递函数为0.5时的频率为0.7lp/mm。结果说明Yb:YAG晶体性能能够满足所需测量要求。
[Abstract]:In order to measure the 纬 -ray time-resolved images with pulse duration less than 20ns, a new inorganic scintillator, Yb: YAGG, was developed, and the luminescence decay time of the crystal was measured experimentally. The luminescence properties of Yb:YAG crystal have been studied by X-ray stimulated luminescence spectra, relative luminescence efficiency and spatial resolution. The experimental results show that there are three decay components in Yb: YAG luminescence. The fast component attenuation constant is 1.2 ns, and the slow component attenuation constant is related to the type of ray. The X-ray emission spectra are in the range of 250nm and 800nm, with three peaks of 320,380 and 500 nm, respectively, and the maximum intensity is at 320nm. The relative luminescence efficiency is 1900phr / MeV; The spatial resolution of Yb:YAG measured by tungsten resolution card is 2lp / m. When the spatial modulation transfer function is 0.5, the frequency is 0.7lp / mmm. the results show that the performance of Yb:YAG crystal can meet the requirement of measurement.
【作者单位】：西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室;西安交通大学能源与动力工程学院;
【基金】：强脉冲辐射环境模拟与效应国家重点实验室基金项目(SKLIPR1405)
【分类号】：O734
【正文快照】： 辐射成像系统是射线测量中一种非常有效的工具,可以将高能脉冲辐射以及高能混合脉冲辐射的特性最终以数字化二维图像显示,从而可以对脉冲辐射源的强度及尺寸进行判断1〗。为了测量辐射源强时间宽度较小(比如20ns)时的γ射线时间分辨图像,要求辐射成像系统关键部件——闪烁体时

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