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Lead bricks are commonly used as radiation shielding. Lead shielding refers to the use of lead as a form of radiation protection to shield people or objects from radiation so as to reduce the effective dose.
Lead is a good shielding material as it has plenty of electrons, two of the key processes by which gamma photons lose energy involve electrons. These are photoelectron production and Compton scattering. The lead also has the advantage that the high atomic number is likely to increase the chance of pair production.