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World wide annual per capita effective doses in year 2000 (UNESCAR 2000)
| Source | Worldwide annual per capita effective dose (mSv) |
| Natural background | 2.4 |
| Diagnostic and medical examinations | 0.4 |
| Atmospheric testing | 0.005 |
| Chernobyl | 0.002 |
| Nuclear power production | 0.0002 |
