Total radioactivity

K (ppm)

U (ppm)

Th (ppm)

Radon concentration (kBq m⁻³) (±9%)

1

1600

6.6

58

40

87.41

2

1300

6.2

43.4

36.5

75.44

3

5560

6.9

210

49

B.D.L.*

4

1700

7.1

59

41

B.D.L.*

5

2810

8.2

92.5

43.9

B.D.L*.

6

1200

6.7

36.3

41.4

54.63