Fig. 1. Schematic of SANS experiment for radioactive samples

Fig. 2. Diagram of SANS device for radioactive sample measurements(a) Design schematics, (b) Photograph of the actual setup in the laboratory

Fig. 3. Structure diagram of sample replacement system structure

Fig. 4. Schematic of Monte Carlo simulation model

Fig. 5. Spatial distribution of dose rate (a), dose rate vs. shielding thickness curve (b)

Fig. 6. Two-dimensional scattering data of A508-III steel (a) and one-dimensional scattering curve (b)