Radiography Isotopes Selenium 75  
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Half Value Thickness
Material Density (g/cm3) 1/2 1/10 1/100
Lead (Pb) 11.3 1 4.75 .
DU (U238) 18.2 . . .
Tungsten (W) 19.3 0.8 4 .
Concrete 2.3 30 90 .
Steel 8 8 27.5 .

All thicknesses in mm

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