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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.
This can't be right since you need 10 half thickness of dirt for a protection factor of 1024 (You want 1000 to 1024 Protection factor) so 3.6 x 10 HVT = 36 inches of dirt, not 24 inches... Another US Gov document says: The required shielding can be accomplished with 10 halving-thicknesses of any material. Shields that reduce gamma ray intensity by 50% (1/2) include 1cm (0.4 inches) of lead, 6cm (2.4 inches) of concrete, 9cm (3.6 inches) of packed dirt or 150m (500 ft) of air. When multiple thicknesses are built, the shielding multiplies. Thus, a practical fallout shield is ten halving-thicknesses of packed dirt.