S/N

α-Activity

Bq l1

β-Activity

Bq l−1

City/Country of the Study

References

1

4.277

11.773

Turkey

Selçuk et al. [47]

2

530

2929

Bayelsa State, Nigeria

Meindinyo and Agbalagba [29]

3

152.11

311.0

Rivers State, Nigeria

Anekwe et al. [28]

4

64.0

411.5

Owian-Aladja, Nigeria

Ogundare and Adekoye [1]

5

522

681

Kavadarci, Macedonia

Dimovska, et al. [30]

6

331.4

11,335

Niger Delta, Nigeria

Present study (soil)

7

259.2

4508

Niger Delta, Nigeria

Present study (sediment)