Sample

Symbol

Spectrometric data

Chemical data

K, %

eU, ppm

eTh, ppm

eU/eTh

eU/K

K, %

U, ppm

Th, ppm

U/K

U/Th

Nwb 1

¨

3.3

12.1

23.7

0.51

3.67

3.7

5.4

18.5

1.5

0.29

Nwb 2

¨

2.8

14.3

21.7

0.66

5.11

3.4

5.4

18.2

1.6

0.30

Nwb 3

¨

4.3

13.5

23.7

0.57

3.14

4.2

6.5

19.3

1.5

0.34

Nwb 4

¨

3.9

12.0

30.3

0.40

3.08

5.1

5.8

23.4

1.1

0.25

Nwb 5

¨

4.2

7.3

27.0

0.27

1.74

3.6

5.1

16.8

1.4

0.30

Nwb 6

▲

4.5

6.7

34.0

0.20

1.49

4.1

3.7

23.2

0.9

0.16

Nwb 7

▲

4.4

13.1

37.7

0.35

2.98

3.9

4.7

26.7

1.2

0.17

Nwb 8

▲

5.3

9.3

33.3

0.28

1.75

3.9

2.8

23.1

0.7

0.12

Nwb 9

▲

4.6

12.2

38.0

0.32

2.65

4.0

4.8

26.6

1.2

0.18