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用于X射线吸收精细结构测量荧光气体探测器的设计与研制

Design and development of fluorescence gas detector for X-ray absorption fine structure
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摘要 在荧光模式的X射线吸收精细结构(X-rayAbsorption Fine Structure,XAFS)实验中,常采用Lytle型探测器测量样品待测元素的荧光信号,它是X射线吸收谱学研究重要的荧光探测器之一。对标Lytle探测器的技术指标和使用工况要求,项目团队研制了一款荧光气体探测器,增加了高电压调节功能,缩短了探测器的响应时间,并根据实际工作条件,对自研探测器的性能进行了测试。测试结果表明:其性能技术指标好于Lytle探测器。目前,该荧光气体探测器已经在上海光源BL11B线站向用户开放使用。 [Background]The gas ionization chamber is a kind of intensity monitoring detector widely used in Synchrotron Radiation Facility.Lytle detector is often used to measure the fluorescence signal from the element of interest in the fluorescent mode XAFS(X-ray absorption fine structure),it is one of the important fluorescence detectors for the X-ray absorption spectrum study and used in XAFS beamline station of Shanghai Synchrotron Radiation Facility(SSRF).However,this type detector is predominantly manufactured by foreign company(The EXAFS Company).[Purpose]This study aims to develop a domestic fluorescent gas detector according to the operating conditions and technical requirements of fluorescent mode XAFS.[Methods]Firstly,a filter and a slit assembly were designed and optimized with Geant4 toolkit.Subsequently,a multilayer grid ionization chamber for fluorescence detection was designed,and the supporting electronics circuit with both high voltage and amplification gain functions was designed.Secondly,all components were manufactured and assembled into a complete detector,and the digital noise,response time,response intensity,and linearity of self-developed detector were tested at BL11B beamline of SSRF.Finally,the actual measured performance of self-developed detector was tested and compared with Lytle detector at BL11B beamline.[Results]The test results indicate that the digital noise level is approximately~3.2×10^(-9) V,which is superior to the(9~10)×10^(-9) V observed in the Lytle detector.Additionally,the response time is less than 2.1 ms,significantly outperforming the Lytle detector's response time of approximately 150 ms.The linearity of the detector's response also exceeds 0.9996.[Conclusions]The self-developed detector with shorter response times and better performance than Lytle detector has been achieved,and the localization replacement of the Lytle type detector is realized.Meanwhile,it has been used in the fluorescent mode XAFS of BL11B beamline at SSRF.
作者 陈雨 王建东 浦世节 高倩 甘涛 黄宇营 张硕 李炯 CHEN Yu;WANG Jiandong;PU Shijie;GAO Qian;GAN Tao;HUANG Yuying;ZHANG Shuo;LI Jiong(Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)
出处 《核技术》 EI CAS CSCD 北大核心 2024年第12期44-52,共9页 Nuclear Techniques
基金 国家自然科学基金(No.12375333)资助。
关键词 X射线荧光气体探测器 X射线吸收精细结构 GEANT4 X-ray fluorescence gas detector XAFS Geant4
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