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Environmental Sciences Europe

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)

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