Comparison of doses from sources of exposure
| Source of exposure | Dose, mSv |
|---|---|
| Dental X-ray | 0.005 |
| 100 g of Brazil nuts | 0.01 |
| Chest X-ray | 0.014 |
| Transatlantic flight | 0.08 |
| Nuclear power station worker average annual occupational exposure (2010) | 0.18 |
| UK annual average radon dose | 1.3 |
| CT scan of the head | 1.4 |
| UK average annual radiation dose | 2.7 |
| US average annual radiation dose | 6.2 |
| CT scan of the chest | 6.6 |
| Average annual radon dose to people in Cornwall | 6.9 |
| CT scan of the whole spine | 10 |
| Annual exposure limit for nuclear industry employees | 20 |
| Level at which changes in blood cells can be readily observed | 100 |
| Acute radiation effects including nausea and a reduction in white blood cell | 1000 |
| Dose of radiation that would kill about half of those receiving it in a month | 5000 |
Source: Public Health England.4 Reproduced under the Open Government Licence v3.0.