X射线与CsI:Na转换屏作用规律的研究

STUDY OF THE INTERACTION PROCESS OF X-RAYS WITH CsI: Na FLUORESCENT SCREEN

本文用MonteCarlo方法模拟了轫致辐射X光子与CsI：Na转换屏的作用过程．给出了正向散射光子的角分布以及正向出射光子的能谱分布，指出正向散射光子的主要成分是CsI：Na的特征辐射光子，其能量为33．17和35．98keV．此外，还对吸收光子数与管电压和CsI：Na层厚度的关系进行了说明．

The interaction process of bremsstrahlung X rays with CsI: Na fluorescent screen has been simulated with the Monte Carlo method in this paper. The angular distributions of the scattered X rays and the spectrum distributions of forward exit photons are presented,which show that the primary fraction of the scattered radiation is the characteristic radiation of CsI: Na with the energies of 33.17and 35. 98keV. Moreover, the dependence of the absorption properties on the tube voltage and the thickness of CsI: Na screen has been described.