Fig. 1. Effective radiation

Fig. 2. Stray radiation

Fig. 3. Increase the cold shield height

Fig. 4. Schematic diagram of pixel FOV

Fig. 5. Surface element irradiation

Fig. 6. Restrain the stray radiation ineffectively

Fig. 7. Dynamically simulation model

Fig. 8. Stray radiation energy diagram

Fig. 9. Restrain the stray radiation effectively

Fig. 10. Test data

Fig. 11. Cold shield structure changed

Fig. 12. Restrain ineffectively

Fig. 13. Restrain effectively

Fig. 14. Stray radiation