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Table 2 Comparison of the Ra-226 and U-238 concentration among rock samples

From: Radiological survey on radon entry path in an underground mine and implementation of an optimized mitigation system

Rock type U-238 (Bq kg−1) Ra-226 (Bq kg−1)
Carbonate ore 1–3 (1.6) 15 & 18 (16)
Black shale 5 9–18 (13)
limestone 1–2 (1.6) 2–6 (3)
Marlstone 1 & 4 3–6 (4)