Country

²³⁸U

²³²Th

⁴⁰K

Ref.

Malaysia

39 ± 0.7

52 ± 1

61 ± 15

[18]

Egypt

79 ± 2

44 ± 1

586 ± 18

[19]

Libya

7.5 ± 2.5

6.7 ± 1.9

4.5 ± 1.3

[20]

Iran

74 ± 4

69 ± 4

1130 ± 32

[21]

Turkey

70 ± 0.8

83 ± 1

1234 ± 7

[22]

Kenya

12.63 - 72.51

11.45 - 58.12

234.8 - 1058.52

[23]

Nigeria

74.74 ± 5.67

199.23 ± 43.30

1021.27 ± 7.14

[24]

This work

51.86 ± 4.38

75.56 ± 7.36

128.98 ± 12.09

World wide

33

45

412

[2]