| S/N | α-Activity Bq l−1 | 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) |