Sample

Activity concentration, Bq/L

Annual effective dose, µSv/yr

⁴⁰K

²⁶⁶Ra

²³²Th

BW₁

8.10 ± 0.06

0.42 ± 0.17

0.31 ± 0.05

6.58

BW₂

24.15 ± 3.23

1.34 ± 0.14

0.41 ± 0.06

138.41

BW₃

1.40 ± 0.22

0.38 ± 0.32

0.65 ± 0.15

9.33

BW₄

4.20 ± 0.23

0.62 ± 0.16

2.35 ± 0.45

10.58

BW₅

3.15 ± 0.22

0.81 ± 0.26

1.62 ± 0.10

15.10

BW₆

3.10 ± 0.41

0.29 ± 0.09

0.36 ± 0.12

5.45

BW₇

30.75 ± 4.62

0.86 ± 0.17

0.15 ± 0.08

131.21

BW₈

5.68 ± 4.83

0.59 ± 0.06

0.13 ± 0.07

21.65

BW₉

13.43 ± 3.76

0.85 ± 0.29

0.18 ± 0.05

66.84

BW₁₀

3.47 ± 0.36

0.36 ± 0.02

1.26 ± 0.16

7.20

BW₁₁

2.53 ± 0.15

0.30 ± 0.08

0.60 ± 0.07

8.24

BW₁₂

7.67 ± 0.25

2.03 ± 0.17

0.38 ± 0.08

28.76

BW₁₃

8.39 ± 0.68

1.66 ± 0.15

1.19 ± 0.12

40.35

BW₁₄

12.0 ± 0.09

1.33 ± 0.16

0.36 ± 0.09

8.50

BW₁₅

3.44 ± 0.12

0.45 ± 0.08

0.45 ± 0.06

9.75

Mean

8.76 ± 1.28

0.82 ± 0.15

0.69 ± 0.11

33.86

WHO Guideline level

1.00

1.00

N/A

100.00