High-energy gamma ray is one of the most important sources of radiation background in direct dark matter detection experiments. High-energy photons produce a low-energy radiation background in high-purity germanium detectors due to Compton scattering. The CDMSlite experiment demonstrates that the Compton steps exist in the Compton spectrum of the low-energy region. The Impulse Approximation (IA) theory explains that the reason for the steps is the electrons in the atom being in a bound state, and uses a scattering function to describe the binding effect of electrons. To explore the relationships between these steps and the scattering function and incident energy, we use the Geant4 program to study the Compton steps in Compton scattering. It is found that as the initial photon energy increases, the Compton steps of the K-shell and the L-shell become more and more gradual until the slope approaches zero.
