Fig. 1. Geant4 model of perovskite quantum dots/polystyrene scintillators

Fig. 2. Attenuation coefficients of different scintillators for 0~120 keV X-ray incident

Fig. 3. Absorption efficiency of different scintillators under 20 keV X-ray incidence.

Fig. 4. The relationship between incident energy and energy deposition efficiency.

Fig. 5. Relationship between energy deposition efficiency and scintillator structure parameters (perovskite quantum dots ratio, thickness)

Fig. 6. The relationship between the spatial resolution and thickness of 80% MAPbBr ₃ scintillator (a), the relationship between the spatial resolution and thickness corresponding to the MTF=0.2 of each scintillator (b) , the relationship between the spatial resolution and thickness of 80% MAPbBr ₃ scintillator measured experimentally (c), and the relationship between the spatial resolution of 0.1 mm MAPbBr ₃ scintillator and the proportion of perovskite QDs (d)

Fig. 7. Spatial resolution of scintillators with different thickness at 20 keV (a) and 50 keV (b) X-ray incidence

Table 1. Parameters of common scintillators

Table 2. The corresponding scintillator thickness when the absorption efficiency reaches 99.5% under 20 keV X-ray incidence