Fig. 1. Mass attenuation coefficient (MAC) of different materials from 0.01 MeV to 15 MeV

Fig. 2. Calculation method of GPF

Fig. 3. Gamma irradiation cabin model

Fig. 4. Spectral response of simulated cabin detectors

Fig. 5. Spectral response of the detector in the experiment

Fig. 6. Response spectra of compartments with different thicknesses

Fig. 7. Instantaneous radiation model and instantaneous energy spectrum

Fig. 8. Detector response spectrum

Fig. 9. Gamma protection factor (GPF) changes with angle

Fig. 10. Changes in GPF along the direction of radiation propagation