Location

²³⁸U

²³²Th

²²⁶Ra

⁴⁰K

References

Congo (RDC) Luilu river

154 ± 6

28 ± 2

172 ± 14

211 ± 76

This study

Congo (RDC) Dilala river

378 ± 13

30 ± 6

202 ± 27

95 ± 13

This study

Egypt

94 ± 6

78 ± 5

74 ± 6

200 ± 5

El-Sadek (2015)

Greece

-

24.5

22.6

497

Papaefthymiou et al. (2007)

Nigeria

16

24

-

35

Arogunjo et al. (2004)

India

119

285

-

1646

Rajesh and Kerur (2018)

Sudan

-

6.02

11.6

158.4

Khatir et al. (1998)

Portugal

(uranium region)

230 ± 10

226 ± 19

619 ± 96

-

Carvalho and Oliveira (2007)