论文标题
在温暖的血浆脉冲高度X射线光谱中分析和缓解脉搏螺旋尾部伪像
Analysis and mitigation of pulse-pile-up tail artifacts in warm-plasma pulse-height X-ray spectra
论文作者
论文摘要
当脉冲的入射速率增加相对于检测系统的每个脉冲的死时间倒数时，脉搏高能分析仪中的脉搏堆积会增加。然后发生观察到的能量分布的变化，随机速率和检测器电子形成脉冲形状。我们专注于X射线光谱中的弱高能尾部，对于部分电离，温暖，纯净的血浆的测量很重要。第一原理的两光子脉冲螺旋 - 螺旋形模型是特定于梯形脉冲的。在测量和模型预测之间发现定量一致。然后，该建模用于诊断脉冲尾式伪像，并在相对较低的计数速率中减轻它们。
Pulse pile-up in pulse-height energy analyzers increases when the incident rate of pulses increases relative to the inverse of the dead time per pulse of the detection system. Changes in the observed energy distributions with incident rate and detector-electronics-formed pulse shape then occur. We focus on weak high energy tails in X-ray spectra, important for measurements on partially ionized, warm, pure-hydrogen plasma. A first-principles two-photon pulse-pile-up model is derived specific to trapezoidal-shaped pulses; quantitative agreement is found between the measurements and the model predictions. The modeling is then used to diagnose pulse-pile-up tail artifacts and mitigate them in relatively low count-rate spectra.
