## 4 Conclusions  
Charged particle radiation can have short and long-term effects on a photoelectric detection system. In particular, photon-counting imaging detectors are highly sensitive to transient charged particles, leading to an increase in dark noise. To block charged particles, the most sensitive area of the detector's input side wall requires an additional shielding ring. To reduce TID damage to electronic devices, the protective structure's  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Shielding** & **Sensitivity** & **Maximum** & **Dark Count Rates** \\
**Configurations** & & **Counting Rates** & **Dark Count Rates** \\ \hline Whole shielding with & 8.79 count s\({}^{-1}\) & 350 kcps & 0.068 * \\ three layers & Rayleigh\({}^{-1}\) & 351 kcps & 0.079 * \\ Local shielding with & 8.78 count s\({}^{-1}\) & 351 kcps & 0.079 * \\ three layers & Rayleigh\({}^{-1}\) & 350 kcps & 1 * \\ Single-layer shielding & 8.80 count s\({}^{-1}\) & 350 kcps & 1 * \\ using aluminum & Rayleigh\({}^{-1}\) & & \\ \hline \hline \end{tabular}  
* The results were normalized using the performance data obtained with single-layer aluminum shielding as a reference.  
\end{table}
Table 4: Performance analysis of various shielding configurations.  
Figure 10: Ionization dose of various particles predicted by the FY-3 satellite orbit after multilayer shielding. At a certain total thickness, TID was obtained by different thickness ratios of three materials. The X and Y coordinates represent the equivalent aluminum thickness of Ta and Al thickness, respectively, while the remaining equivalent aluminum thickness is assigned to HDPE. To facilitate comparison and comprehension, the maximum TID is used as a normalization benchmark. It is evident from the figure that TID is significantly different for the various proportions of Al, Ta, and HDPE under the same weight. (**a**) The total thickness is 3 mm; (**b**) the total thickness is 5 mm; (**c**) the total thickness is 7 mm.  
geometry is crucial. By including the outer edge of the finite boundary and considering the non-metallic structure's equivalent thickness, which refers to the particle's range in the PCB, the all-directional protection of every point is achieved. In addition to the protective structure's geometry, selecting appropriate shielding materials is also crucial. Charged particles have a broad energy distribution and penetrate shielding materials differently depending on their range. Multilayer materials provide superior shielding results compared to monolayer materials. Adjusting the mass ratio of different materials can determine optimal shielding strategies with the same mass. It is important to consider the equipment's particle environment in orbit in order to choose the right shielding material and mass ratio combination.  
Further research will be conducted on the shielding properties of materials such as aluminum alloy and boron-polyethylene, which are suitable for aerospace applications due to their toughness and thermal stability. The installation of shielding materials and their distance from protected objects will also be studied in order to improve shielding effect and reliability. Based on these strategies, a photoelectric detection instrument is being considered for the next generation of Fengyun satellites.