density of hollow tile blocks

[Lorne Michael E PHNS <LorneME@phnsy.navy.mil>]

Does anybody have the density of hollow tile blocks (without concrete in the
hollow parts)?  They are also called cinder blocks or concrete masonary
units.  The standard dimension is 8"x8"x16".  They resemble a figure eight
with squared off edges and are commonly used for foundations and walls.  I
need this information for shielding calculations.  Thanks for the help.

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