Measured specific radioactivity of dry samples (Bq∙kg⁻¹)

Th/Ra

ratio

Sample ID

²²⁶Ra

SD%

²³²Th

SD%

⁴⁰K

SD%

Soil samples

SB-L-1

86.12

6.72

92.64

5.15

1073.77

4.23

1.08

SB-L-2

59.73

3.98

88.51

1.06

789.54

5.45

1.48

SB-L-3

73.01

5.45

82.17

4.31

1125.40

6.34

1.13

SB-L-4

50.68

5.41

85.56

3.08

1089.72

4.23

1.69

SB-L-5

84.56

6.49

99.80

3.83

859.51

7.24

1.18

SB-L-6

67.29

7.14

102.64

5.68

879.27

5.64

1.53

SB-L-7

72.32

4.03

67.39

7.45

942.87

5.21

0.93

SB-L-8

70.41

3.96

74.99

3.60

824.31

6.45

1.07

SB-L-9

41.52

7.27

69.30

8.95

1097.68

6.23

1.67

SB-L-10

53.40

6.90

68.65

5.18

787.51

7.56

1.29

Average

65.90

5.74

83.17

4.83

946.96

5.86

1.30

Sand samples

SB-L-11

77.84

7.01

95.29

9.19

624.55

5.73

1.22

SB-L-12

29.75

12.42

73.37

3.58

451.45

4.37

2.47

SB-L-13

27.82

9.71

45.77

3.00

510.58

3.25

1.65

SB-L-14

71.87

1.36

84.82

0.73

401.83

6.82

1.18

SB-L-15

28.21

2.49

38.43

8.34

456.79

4.31

1.36

SB-L-16

34.89

8.29

64.17

1.09

626.18

3.24

1.84

SB-L-17

48.12

4.50

58.17

2.93

416.04

6.54

1.21

SB-L-18

62.89

5.49

88.81

3.64

404.83

4.52

1.41

SB-L-19

89.12

2.73

98.59

2.47

649.22

3.67

1.11

SB-L-20

24.72

9.92

47.45

2.09

580.45

5.35

1.92

Average

49.52

6.39

69.49

3.71

512.19

4.78

1.54

Sediment samples

SB-L-21

28.56

2.40

46.80

4.45

585.71

4.76

1.64

SB-L-22

57.08

4.22

54.24

1.07

542.38

6.75

0.95

SB-L-23

65.41

4.72

87.59

1.99

654.94

5.36

1.34

SB-L-24

17.09

7.44

25.91

1.24

bd^*

bd

1.52

SB-L-25

49.27

5.24

40.93

2.70

bd

bd

0.83

SB-L-26

67.10

3.41

67.79

1.73

bd

bd

1.01

SB-L-27

23.69

6.73

16.90

3.97

bd

bd

0.71

SB-L-28

21.95

1.03

25.26

4.81

bd

bd

1.15

SB-L-29

55.39

3.75

16.14

4.77

bd

bd

0.29

SB-L-30

46.68

3.10

76.99

0.68

bd

bd

1.65

Average

43.22

4.20

45.85

2.74

594.34

5.62

1.11