在AMS测量中,对于某些同量异位素,在高能端分析磁铁之后,能量仍然非常接近,此时,利用半导体探测器无法作出能量区分,从而无法鉴别粒子。通过将粒子注入Q3D管道,通过Si3N4膜,不同原子序数的离子能量损失不同,离子能量便初步分开。经过Q3D后,离子会聚焦在不同点位置,但是对于能量差别很小,以及能量离散相对较大的离子仍然不可完全分开。所以,在焦平面前或者焦平面上,加装一个△E电离室,电离室的入射窗规格为70 mm×40 mm,上面附有一层厚 In AMS measurements, for some of the isoboles, the energies are still very close after high-end analysis of the magnet, at which point the energy can not be distinguished using the semiconductor detector and the particles can not be identified. By injecting particles into the Q3D pipe and passing through the Si3N4 film, the energy loss of ions with different atomic numbers is different, and the energy of the ions is initially separated. After Q3D, the ions will focus on different points, but for the small differences in energy, ions with relatively large energy dispersion still can not be completely separated. Therefore, in front of the focal plane or focal plane, the installation of a △ E ionization chamber, ionization chamber of the entrance window size 70 mm × 40 mm, with a layer of thick