Studied region

Sample No.

Latitude

Longitude

Sand

Silt

Clay

⁴⁰K

²³⁸U

²³²Th

¹³⁷Cs

˚N

˚E

%

%

%

Bq/kg

Bq/kg

Bq/kg

Bq/kg

Al-Qassim

1

26.21

43.89

72.8

15.2

12.0

283.11

23.61

27.96

4.62

2

26.41

43.82

88.8

7.2

4.0

163.16

27.45

20.19

4.09

3

26.44

43.69

88.9

8.1

3.0

153.98

22.07

24.95

4.25

4

26.43

43.71

84.8

10.2

5.0

241.53

28.04

33.65

4.88

Tabuk

1

28.40

36.87

80.6

9.4

10.0

313.39

45.67

45.28

16.51

2

28.40

36.87

75.7

12.3

12.0

310.45

48.06

60.55

16.09

3

28.40

36.80

68.5

17.5

14.0

350.18

42.20

64.10

18.68

4

28.40

36.78

63.6

16.4

20.0

311.20

77.84

113.15

19.91

5

28.43

36.62

63.8

15.2

21.0

338.37

76.46

75.59

21.19

Al-Kharj

1

24.32

47.13

82.2

9.9

7.9

159.48

18.42

13.42

4.12

2

24.18

47.22

86.4

8.8

4.8

204.80

17.49

25.03

4.59

3

24.26

47.26

75.3

16.7

8.0

141.11

16.88

12.45

3.55

4

24.21

47.57

71.8

17.2

11.0

129.20

18.81

12.26

3.94

5

24.20

47.56

85.7

7.3

7.0

103.24

19.38

15.00

3.03

Wadi Aldawaser

1

20.42

44.74

74.8

17.2

8.0

199.12

21.05

20.14

5.54

2

20.43

44.73

80.3

15.7

4.0

217.15

23.30

24.62

5.52

3

20.42

44.71

79.7

16.3

4.0

195.98

23.75

24.81

5.17

4

20.44

44.74

84.4

12.6

3.0

169.92

22.25

27.69

4.79

Aljouf

1

29.99

40.12

88.8

7.2

4.0

234.23

29.63

25.19

11.46

2

30.00

40.12

80.7

8.3

11.0

565.57

41.78

54.35

18.06

Hail

1

27.79

41.73

74.1

15.9

10.0

518.03

51.01

56.76

19.75

2

27.80

41.75

77.3

13.7

9.0

492.63

43.73

36.18

13.96

3

27.80

41.75

71.7

15.3

13.0

477.64

71.95

55.78

23.63

4

27.82

41.73

65.9

20.1

14.0

644.54

49.58

47.62

18.77

Riyadh

1

24.41

46.65

84.6

12.4

3.0

185.30

21.28

17.23

10.45

2

24.41

45.89

86.5

9.5

4.0

221.63

19.83

19.21

9.44

3

24.23

47.65

75.6

12.4

12.0

162.10

20.19

17.88

9.58

4

24.33

47.14

83.2

9.8

7

114.65

12.88

10.42

4.81