Country | Mean activity concentration (Bq・kg−1) | References | ||
226Ra | 232Th | 40K | ||
Al Rakkah East of Saudi Arabia | 23 | 20 | 233 | Present study |
Riyadh, Center of Saudi Arabia | 14.5 | 11 | 225 | [28] |
Tayma, north west of Saudi | 30.77 | 27.59 | 161.8 | [14] |
Albaha, South of Saudi Arabia | 37 | 32 | 343 | [30] |
Jeddah, West of Saudi Arabia | 9.3 | 7.4 | 369 | [31] |
Kuwai, North region | 66.6 | 11.3 | 384.5 | [15] |
Kuwai, south region | 13.6 | 2.4 | 110.4 | [15] |
Oman | 29.7 | 15.9 | 225 | [16] |
Qatar | 23.2 | 4.5 | 127.1 | [32] |
Jordan | 49 | 27 | 291 | [13] |
Syria | 23 | 20 | 270 | [3] |
Iran | 28 | 22 | 640 | [3] |
India | 26.4 | 51.2 | 5.6 | [9] |
Pakistan | 25.8 | 49.2 | 561.6 | [7] |
Pakistan | 73.9 | 152.2 | 325.3 | [5] |
China | 38.5 | 54.6 | 584 | [10] |
Japan | 29 | 28 | 310 | [3] |
Yemen | 44 | 58 | 823 | [33] |
Egypt, National range | 37 | 18 | 320 | [3] |
Nigeria | 7.8 | 29.4 | 229 | [34] |
Turkey | 37 | 40 | 667 | [35] |
Algeria | 50 | 25 | 370 | [3] |
Sweden | 42 | 42 | 680 | [3] |
China | 32 | 41 | 440 | [3] |
India | 41 | 29 | 400 | [3] |
United State | 40 | 35 | 370 | [3] |
World average | 32 | 45 | 420 | [3] |