Wang Ming, Zhou Jianbin, Wang Xueyuan, Wang Huaiping, Liu Yi, Hong Xu, Yang Tibo
College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, No.1 the Third Section East, Er Xianqiao Road, Chengdu, Sichuan, 610059, People's Republic of China.
College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, No.1 the Third Section East, Er Xianqiao Road, Chengdu, Sichuan, 610059, People's Republic of China.
Appl Radiat Isot. 2023 Jun;196:110772. doi: 10.1016/j.apradiso.2023.110772. Epub 2023 Mar 10.
In order to obtain a precise X-ray counting rate, a window shaping algorithm is proposed and is applied. The proposed algorithm shapes original pulses into window pulses with sharp edge and stable width. In the experiment, the measured counting rate at 3.9uA tube current is used to estimate the incoming counting rate. The dead time and corrected counting rate are estimated by the paralyzable dead-time model. The experimental results show that the mean dead time of radiation events is 260ns and the relative mean deviation is 3.44% in the newly designed counting system. While the incoming counting rate is in the range of 100kcps to 2Mcps, the relative error of the corrected counting rate compared with the incoming counting rate is less than 1.78%. The proposed algorithm suppresses the dead time swing and improves the accuracy of the total counting rate of X-ray fluorescence spectrum.
为了获得精确的X射线计数率，提出并应用了一种窗口整形算法。所提出的算法将原始脉冲整形为具有尖锐边缘和稳定宽度的窗口脉冲。在实验中，使用在3.9μA管电流下测得的计数率来估计入射计数率。通过可并行死时间模型估计死时间和校正后的计数率。实验结果表明，在新设计的计数系统中，辐射事件的平均死时间为260ns，相对平均偏差为3.44%。当入射计数率在100kcps至2Mcps范围内时，校正后的计数率与入射计数率相比的相对误差小于1.78%。所提出的算法抑制了死时间波动，提高了X射线荧光光谱总计数率的准确性。
