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Environmental Sciences Europe

Table 1 Concentrations of natural radionuclides in the mine rock samples (Bq kg−1)

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

 

Min.–Max

Average

Samples

Ra-226

Th-232

K-40

Ra-226

Th-232

K-40

Ra-226

Th-232

K-40

Carbonate (Mn ore)

C-1

15 ± 4

7 ± 2

245 ± 40

15–18

7–25

244–245

16

16

245

C-2

18 ± 4

25 ± 5

244 ± 42

Underlayer limestone (mullock)

F-1

4 ± 1

6 ± 2

45 ± 9

2–6

5–8

45–102

4

6

75

F-2

4 ± 1

7 ± 2

62 ± 12

F-3

2 ± 1

8 ± 2

84 ± 13

F-4

6 ± 2

5 ± 1

102 ± 17

F-5

4 ± 1

5 ± 1

83 ± 14

Dogger limestone (mullock)

D-1

2 ± 1

6 ± 2

88 ± 14

2–3

2–7

54–95

2

5

72

D-2

2 ± 1

7 ± 2

95 ± 16

D-3

3 ± 1

2 ± 1

66 ± 11

D-4

2 ± 1

5 ± 1

54 ± 10

D-5

2 ± 1

3 ± 1

58 ± 10

Black shale (Mn ore)

B-1

18 ± 5

21 ± 6

299 ± 50

9–18

15–21

266–456

12

19

375

B-2

9 ± 2

16 ± 4

345 ± 60

B-3

12 ± 3

15 ± 4

266 ± 45

B-4

10 ± 3

16 ± 4

315 ± 54

B-5

13 ± 4

20 ± 6

456 ± 78

B-6

13 ± 4

18 ± 5

438 ± 74

B-7

11 ± 3

21 ± 5

451 ± 76

B-8

11 ± 3

19 ± 4

398 ± 69

B-9

13 ± 4

20 ± 5

415 ± 70

B-10

10 ± 3

20 ± 5

365 ± 62

Underlayer black shale (Mn ore)

UB-1

11 ± 3

13 ± 3

255 ± 43

11–21

12–26

218–724

16

19

432

UB-2

21 ± 6

22 ± 6

345 ± 58

UB-3

18 ± 4

26 ± 7

218 ± 38

UB-4

20 ± 6

22 ± 5

654 ± 110

UB-5

11 ± 3

12 ± 3

724 ± 123

Puce greenish Marl (mullock)

R-1

4 ± 1

8 ± 2

66 ± 10

3–6

6–8

66–84

4

7

74

R-2

3 ± 1

8 ± 2

74 ± 13

R-3

4 ± 1

8 ± 2

84 ± 15

R-4

5 ± 2

7 ± 2

78 ± 14

R-5

6 ± 2

6 ± 2

69 ± 13

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