“…That interaction means being completely absorbed or losing energy, which will weaken or destroy the gamma radiation. Therefore, when choosing a shielding material, attention must be paid to the factor of high electron density (electron/cm 3 ), but for high electron density, the number of protons (the Z number) of the atoms should be large, and the density of the shielding material also should be greater (atoms/cm 3 ) [7]. Therefore, the metal element barium (Ba) (Z = 56) in the barium sulfate compound BaSO 4 is suitable for radiation shielding, because it is chemically stable, easy to preserve, pack, and transport, less affected by the surrounding environment, easy to produce, has low cost, it is safe, and easy to use [8,9].…”