Interactions of photons with matter have three energy loss
mechanisms: photoelectric effect, Compton scattering and pair
production. If a photon enters matter with an energy under
1.022 Mev, it may interact by both processes of photoelectric effect
and Compton scattering. The photoelectric absorption probability
strongly depends on the high atomic number Z [10]. Thus, in this
work, the existence of high-Z elements, Pb and Ba, plays an important
role in radiation protection property of the composite; and the
chemical reaction between Al and BPOp will not affect anti-radiation
property. Additionally, the presence and symmetrical distribution
of nanosized lead particles serve to the increase of interaction
probability between photon and the composite.