Country | Average activity concentration (Bq/kg) | References | ||
226Ra | 232Th | 40K | ||
Yemen | 14. 28 | 25.78 | 566.05 | Present study |
India | 45.68 | 17.11 | 1535.44 | [9] |
Saudi Arabia (Al-Qassim) | 9.3 | 12.3 | 535 | [10] |
Nigeria | 12.12 | 60.117 | 426.51 | [11] |
Malaysia | 57 | 68 | 427 | [12] |
Egypt | 16.4 | 7.1 | 102 | [13] |
Turkey | 21.0 | 23.5 | 363.5 | [14] |
Jordan | 57.7 | 18.1 | 138.1 | [15] |
World average | 30 | 35 | 400 | [8] |