一台高计数率GEM X射线成像装置原型  

A Prototype of X-Ray Imaging Device Based on the GEM Detector

作　　者：李澄[1] 孙勇杰[1] 周意[1] 安少辉[1] 许咨宗[1] 

机构地区：[1]中国科学技术大学近代物理系,合肥230027

出　　处：《高能物理与核物理》2005年第1期68-71,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (10 0 75 0 45 )资助~~

摘　　要：研制一种新型的三层级联倍增GEM气体探测器 ,其有效增益达到 10 5,用于高亮度X射线成像 .设计和制作了精密的微条读出和信号引出方法 ,采用高速SCSI接口的机箱控制器及计算机控制系统 ,用于该探测器的射线定位测量 ,在此基础上建立了一台GEM X射线成像装置原型 .实验结果显示 :在X射线强度为 10 5Hz/mm2 ,其增益稳定性 <1% ,位置分辨 <10 0 μm ,并获得了清晰的两维图像 .A prototype of X-ray imaging device based on triple Gas Electron Multiply detector is studied, which has an effective gain up to 10 5 and can be used in high rate X-rays imaging. The precise method of micro-strip readout is designed for X-rays localization, and the crate controller of high-speed SCSI interface is applied for the data acquisition. The test results show that the position resolution of measurement system is less than 90μm and the stability of its effective gain is better than 1% under the X-ray flux of 10 5Hz/mm 2.

关 键 词：X射线成像 SCSI接口 机箱 计算机控制系统 气体探测器 显示 高速 增益 高亮度 级联 

分 类 号：TL811[核科学技术—核技术及应用]