A novel X-ray tube spectra reconstruction method based on transmission measurements  

作　　者：Jing Cao Chun-Yu Jiang Yan-Feng Zhao Qing-Wei Yang Ze-Jie Yin 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026, China [2]Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China [3]Southwestern Institute of Physics, Chengdu 610041, China

出　　处：《Nuclear Science and Techniques》2016年第2期73-78,共6页核技术（英文）

基　　金：Supported by National Natural Science Foundation of China(Nos.11375195,11375263);National Magnetic Confinement Fusion Science Program of China(2013GB104003)

摘　　要：A novel X-ray tube spectrum reconstruction method has been proposed based on transmission measurements. Aluminum bars of varying lengths attenuate the X-rays to different levels. The detectors are of lutetium yttrium oxyorthosilicate scintillator and silicon photomultiplier. With the detected X-ray intensities, the X-ray spectrum is unfolded using the least square method. The detectors, aluminum bars, and collimating apertures are integrated in a detection module made of lead. Its response to X-ray is calculated by Monte Carlo codes Geant4. Due to the high photon flux, the detectors work in current mode.The electronics system, consisting of 24-bit high-precision ADCs with 144 KSPS sampling rate and field programmable gate array, makes the data acquisition process effective and precise. Measurements on a 70-k Vp tungsten anode X-ray were taken to verify the method. The unfolded spectrum agrees well with the simulated spectrum,demonstrating that the method is reliable and practical.A novel X-ray tube spectrum reconstruction method has been proposed based on transmission measurements. Aluminum bars of varying lengths attenuate the X-rays to different levels. The detectors are of lutetium yttrium oxyorthosilicate scintillator and silicon photomultiplier. With the detected X-ray intensities, the X-ray spectrum is unfolded using the least square method. The detectors, aluminum bars, and collimating apertures are integrated in a detection module made of lead. Its response to X-ray is calculated by Monte Carlo codes Geant4. Due to the high photon flux, the detectors work in current mode.The electronics system, consisting of 24-bit high-precision ADCs with 144 KSPS sampling rate and field programmable gate array, makes the data acquisition process effective and precise. Measurements on a 70-k Vp tungsten anode X-ray were taken to verify the method. The unfolded spectrum agrees well with the simulated spectrum,demonstrating that the method is reliable and practical.

关 键 词：X射线管 重建方法 传输测量 光谱 现场可编程门阵列 透射 GEANT4 蒙特卡罗程序 

分 类 号：TN14[电子电信—物理电子学] TN911.73