| Locations | Activity Concentration (Bq/kg) | Reference | ||
| U-238 | Th-232 | K-40 | ||
| River Benue, Makurdi | 1.17 | 3.31 | 405.94 | Present study |
| Osun River, Nigeria | 24.00 | 35.70 | 162.38 | Oyebanjo et al., 2012 |
| Charfassion Island, Bhola Banglandesh | 16.82 | 32.84 | 743.52 | Nizam et al., 2013 |
| Coastline of Erongo Region Namibia | 173 | 37.77 | 441.78 | Onjefu et al., 2016 |