Fig. 1. Structure diagram of array NaI (Tl) detector device for radiation source location

Fig. 2. Diagram of Monte Caro simulation model with parallel beam γ-ray

Fig. 3. Collision distribution of particles in array detector (a) θ = 60°，(b) θ = 210°

Fig. 4. Distribution curves of MC simulation gross counts with γ-ray incidence angles

Fig. 5. Physical photos of array NaI(Tl) detector radiation source location device (a) Array NaI(Tl) detector, (b) Array rotation platform

Fig. 6. Physical diagram of linear orbits (a) Orbits, (b) Radioactive source bracket platform

Fig. 7. Diagram of radioactive angle response experiment

Fig. 8. Experiment results of radioactive angle response

Fig. 9. Proportions of gross count from energy spectra of radioactive angle response experiment

Fig. 10. Diagram of radioactive location response experiment

Fig. 11. Results of location response experiment (a) S=1 m, (b) S=2 m, (c) S=3 m, (d) S=4 m, (e) S=5 m

Fig. 12. Predicted mean angle deviation of location response experiment

Fig. 13. Results of relative height response experiment(a) Relative height 0.3 m, (b) Relative height 0.4 m, (c) Relative height 0.5 m, (d) Relative height 0.6 m

Fig. 14. Predicted mean angle deviation of relative height response experiment

Fig. 15. Predicted mean angle deviation with various energy γ-ray

Fig. 16. Varition of mean localization deviation with the primary γ-ray intensity

Fig. 17. Minimum localizable intensity of radiation source