Sample | Ash | N | Activity of radionuclide (Bq/kg) | ||||
K40 | Ra226 | Th232 | Po210 | ||||
Witbank (Present Study) | Fuel (Coal) | 25% | 9 | 88 ± 6 | 21 ± 1 | 22 ± 4 | 46 ± 1 |
Fly ash | 9 | 348 ± 8 | 80± 3 | 88 ± 6 | 193± 8 | ||
Bottom ash | 9 | 334 ± 8 | 63± 3 | 84 ± 6 | 41 ± 7 | ||
Waterberg (Present Study) | Fuel (Coal) | 33% | 9 | 91 ± 3 | 52 ± 5 | 21 ± 1 | 70 ± 5 |
Fly ash | 9 | 319 ± 4 | 166 ± 8 | 63 ± 6 | 280 ± 8 | ||
Bottom ash | 9 | 302 ± 5 | 150 ± 13 | 82 ± 8 | 3 ± 1 | ||
Sasolburg (Present Study) | Fuel (Coal) | 41% | 9 | 110 ± 4 | 24 ± 5 | 19 ± 3 | 83 ± 3 |
Fly ash | 9 | 286 ± 4 | 65± 6 | 45 ± 6 | 265 ± 13 | ||
Bottom ash | 9 | 242 ± 13 | 51± 6 | 44 ± 2 | 2 ± 1 | ||
Spain: Teruel UPT [25] | Fuel (Coal) | 22% | 2 | 66 ± 15 | 54 ± 3 | 21 ± 3 | 65 ± 11 |
Fly ash | 2 | 306 ± 13 | 191 ± 9 | 74 ± 3 | 257 ± 30 | ||
Bottom ash | 2 | 235 ± 11 | 149 ± 6 | 66 ± 3 | 57 ± 7 | ||
Spain: Litoral UPT [25] | Fuel (Coal) | 16% | 2 | 70 ± 16 | 15 ± 3 | 13 ± 3 | 33 ± 4 |
Fly ash | 2 | 338 ± 16 | 107± 4 | 87 ± 4 | 300 ± 40 | ||
Bottom ash | 2 | 278 ± 16 | 81 ± 4 | 64 ± 4 | 7 ± 1 | ||
Spain: Compostilla II [24] | Fuel (Coal) | 37% | 2 | 334 ± 13 | 34 ± 3 | 33 ± 3 | 118 ± 40 |
Fly ash | 2 | 1109 ± 49 | 94 ± 4 | 93 ± 4 | 416 ± 57 | ||
Bottom ash | 2 | 1077 ± 48 | 86 ± 2 | 89 ± 3 | 24 ± 12 | ||
Spain: Teruel [24] | Fuel (Coal) | 28% | 2 | 77 ± 32 | 56 ± 5 | 21 ± 2 | 65 ± 11 |
Fly ash | 2 | 310 ± 14 | 190 ± 2 | 74 ± 2 | 257 ±30 | ||
Bottom ash | 2 | 238 ± 13 | 149 ± 5 | 66 ± 3 | 57 ± 7 | ||
Spain: Litoral [24] | Fuel (Coal) | 15% | 4 | 62 ± 30 | 18 ± 4 | 20 ± 6 | 47 ± 20 |
Fly ash | 4 | 250 ± 144 | 158 ± 48 | 154 ± 53 | 505 ± 321 | ||
Bottom ash | 4 | 224 ± 105 | 144 ± 55 | 138 ± 61 | 9 ± 4 |