CsI(Tl)闪烁体软X光能量响应的模拟研究

Soft X-ray energy corresponding of CsI(Tl) scintillator

Csl（-r1）闪烁体是X光转换为可见光比较晕要的一个部件，在惯性约束聚变中的x光诊断等方面有着卜分晕要的应用。通过Geant4软件较为全面地分析了CsI（T1）闪烁体软X光能量响应，模拟了1～5keV的软X光入射不同厚度（20，30，50μm）CsI（TI）的能量沉积谱，探究了粒子之间相互作用的物理过程，并比较了不同能量软x光在不同厚度CsI（T1）闪烁体巾的沉积效率。仿真结果表明，随着CsI（T1）闪烁体厚度的增加，软x光侄CsI（TI）闪烁体中沉积的能量也逐渐增加，沉积效率与CsI（T1）闪烁体厚度成正比。模拟研究为选择合适厚度的闪烁体做低能段软X光探测实验做铺垫。

The CsI（T1） scintillator is a key part for the transition from X-ray to visible light in X-ray detectors, which is ofcrucial importance in X-ray diagnosis for inertial confined fusion. Geant4 is used to imitate the mechanism of the energy depositionof X-ray in the CsI（T1） scintillator. 1-5 keV X-rays could deposit energies into the CsI（T1） scintillator with different thickness（20, 30, or 50 μm）. The deposition energy and deposition efficiency are compared. The results show that the deposition energyincreases with the increase of CsI（T1） scintillator thickness. This theoretically investigation has provided valid proofs for the prep-aration of the forthcoming experimental study.