It would be necessary, during a whole year, to have a dose rate of 114 nanosievert per hour (nSv / h) to reach the limit of exposure of the public which is 1 millisievert per year (mSv / year) apart from medical exposures and natural.
From 10 mSv, we recommend sheltering populations.
Above 50 mSv, evacuation is recommended.
For nuclear workers, the regulatory exposure limit is 20 mSv / year.
An exposure at a dose of 100 mSv / year may be authorized for technical emergency interventions and 300 mSv / year for a rescue intervention for victims.
For a level below 100 mSv, no long-term health effects have been demonstrated.
Beyond 100 mSv, long-term effects of ionizing radiation have been demonstrated by epidemiological studies (study of the populations of Hiroshima and Nagasaki).
1000 mSv is a very high dose which corresponds to 1 Gray. This level of exposure to radioactivity has a direct effect on health and involves a risk to the life of the exposed person in the weeks and months that follow. From this dose level, ionizing radiation begins to destroy the bone marrow. They reach stem cells and cause a decrease in blood platelets and white blood cells.
