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


Typical range 1-4

World average 2

Average specific activity (pCi/kg-1) 670

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