Table 3.
A comparison of doses and dose coefficients of radon and thoron between the present study of the Mamuju HNBRA and other previously studied HNBRAs.
| Country | HNBRA | Area characteristic | Average annual internal dose (mSv) | Average annual external dose (mSv) | Average annual effective dose (mSv) | Dose coefficient or dose conversion factor of radon (mSv (Bq h m−3)−1) | Dose coefficient or dose conversion factor of thoron (mSv (Bq h m−3)−1) | Reference | |
|---|---|---|---|---|---|---|---|---|---|
| Brazil | Guarapari | Monazite sands | – | – | 7 | – | – | 3,34 | |
| China | Yangjiang | Monazite particles | 4.1 | 2.1 | 6.4 | 9 × 10–6 | 4 × 10–5 | 3,8,34 | |
| India | Kerala | Monazite sands | 2.4 | 4.5 | 6.9 | 9 × 10–6 | 4 × 10–5 | 7,9,34 | |
| Iran | Ramsar | Sulfurous hot springs and 226Ra | 4.2 | 6 | 10.2 | 9 × 10–6 | – | 3 | |
| Present study | Mamuju | Volcanic rocks and basalt rock type containing 232Th and 238U | 26.9 | 5 | 32 | 1.7 × 10–5 | 1.07 × 10–4 | Present study | |
| World average | – | 0.48 | 2.4 | – | – | 2 | |||