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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.
So you know that there are 3 kind of radiation, alpha, beta and gamma. Alpha can be stopped by a piece of paper. Beta by a few cm thick material but gamma has a high penetrating power and can travel a long distance in normal media. Hence a high density lead shield is used primarily for stopping gamma rays. High density means more interactions and hence quicker attenuation of gamma rays.