U

Rocks

Igneous

Silica (granites) 4.7

Intermediate (diorites) 1.8

Mafic (basalt) 0.9

Ultramafic (dunites) 0.03 Sedimentary

Limestones 2.2

Carbonates 2.1

Sandstones 1.5

Shales 3.5

(Mean value in earth's crust) 3.0

Soils

Typical range 1-4

World average 2

Average specific activity (pCi/kg-1) 670

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