CONTINUOUS BACKGROUNDS IN PIXE
CONTINUOUS BACKGROUNDS IN PIXE
复制标题
PIXE 中的连续背景
DOI：
10.1142/s0129083590000025
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
S. Morita
中科院分区：
文献类型：
--
作者：
K. Ishii;S. Morita
对光离子原子碰撞产生的连续X射线进行了实验和理论研究，结果表明，在0.5 MeV ~ 40 MeV的射离子能量范围内，实验结果可以用原子轫致辐射（AB）、二次电子轫致辐射（SEB）和准自由电子轫致辐射（QFEB）三种辐射过程很好地解释。总结了在x射线谱、弹丸-能量依赖关系和弹丸-电荷依赖关系以及这些轫致辐射的角分布方面的研究结果，并提出了AB在重离子原子碰撞中的重要性。对康普顿散射背景、宇宙射线、卢瑟福散射背景、探测器的信号叠加和响应函数、目标的充电效应、自然背景等连续背景的其他来源也进行了讨论。在对连续背景进行分析的基础上，估计了PIXE的检出限。
Continuous X rays produced by light-ion·atom collisions, which mainly form continuous backgrounds and determine the detection limit of PIXE, have been experimentally and theoretically studied, and it is shown that the experimental results over the wide range of projectile-ion energy from 0.5 MeV to 40 MeV can be well explained by three kinds of radiative process: atomic bremsstrahlung (AB), secondary-electron bremsstrahlung (SEB), and quasifree electron bremsstrahlung (QFEB). Results on the X-ray spectra, the projectile-energy dependence and the projectile-charge dependence, and on the angular distribution of these bremsstrahlungs will be summarized and the importance of AB in heavy-ion atom collision is presented. Discussions are also given on the other origins of continuous backgrounds such as the Compton scattering background, cosmic rays, the Rutherford scattering background, piling up of signals and response functions of detector, charge up effect of the target and natural backgrounds. On the basis of analyses of continuous backgrounds, the detection limit of PIXE is estimated.