| Location | average concentration Bq/Kg | Total average annual effective dose (μSv/y) | Reference | |||||||
| 238U | 226Ra | 232Th | 40K | 137Cs | 238U | 226Ra | 232Th | 40K | ||
| Hong Kong | 0.018 | 0.005 | 0.47 | 86.65 | o.11 | 0.018 | 0.083 | 2.585 | -- | [29] |
| Oman | 0.49 | -- | 0.40 | 134.0 | 0.33 | -- | -- | -- | -- | [30] |
| Nigeria | -- | 1.860 | 1.65 | 58.00 | -- | -- | -- | -- | -- | [31] |
| Kainji lake | -- | 37.22 | 94.82 | 384.98 | -- | -- | 29.802 | 28.77 | 9.73 | [32] |
| Brazil | 0.05 | 0.19 | 0.06 | -- | -- | -- | -- | -- | -- | [33] |
| Saudi Arabia Jeddah | 1.63 | 1.60 | 1.66 | 208.13 | 0.96 |
|
|
|
| Present Work |