Table 2.
Comparison of the mean with some selected studies.
| Case study | U-238 (Bq/kg) | Th-232 (Bq/kg) | K-40 (Bq/kg) | Dose rate (nGy/hr) | Country | Reference |
|---|---|---|---|---|---|---|
| Phosphogypsum | 206.8 | 99.1 | 15.1 | 154.6 | Brazil | [33] |
| Kaolin | 964.7 | 251.6 | 58.9 | 581 | Egypt | [34] |
| Lambapur soil | 93.1 | 141.0 | --- | --- | India | [35] |
| Mallapuram soil | 219.0 | 271.7 | --- | --- | India | [35] |
| Peddagattu soil | 35.8 | 93.8 | --- | --- | India | [35] |
| Clay | 39.3 | 49.6 | 569.5 | 74.1 | Turkey | [36] |
| Kaolin | 82.0 | 94.8 | 463.6 | 117.7 | Turkey | [36] |
| Soil profile 1 | 13.71 | 10.45 | 57.17 | 15.20 | Nigeria | [37] |
| Soil profile 2 | 11.49 | 8.83 | 59.77 | 13.30 | Nigeria | [37] |
| Soil | 19.16 | 48.56 | 1146.88 | 89.6 | India | [38] |
| Brick, Soil, Cement, Sand and Clay | 9.19 | 45.60 | 295.11 | 53.50 | India | [32] |
| Floor ceramic | 101.22 | 87.53 | 304.57 | 213.98 | Iraq | [39] |
| Wall ceramic | 102.12 | 70.90 | 328.60 | 178.40 | Iraq | [39] |
| Kaolin deposits | 38.2 | 65.1 | 93.9 | 59.6 | Nigeria | Present study |
| Soil and rock | 32.0 | 45.0 | 420.0 | 84.0 | Global | [31] |