Radiography Isotopes Cobalt 60  
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Half Value Thickness
Material Density (g/cm3) 1/2 1/10 1/100
Lead (Pb) 11.3 12.4mm 41mm .
DU (U238) 18.2 6.5mm 22mm .
Tungsten (W) 19.3 . . .
Concrete 2.3 . . .
Steel 8 . . .
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