Path and extension of the radioactive cloud
Representation of cesium-137 radioactivity concentration over Europe between 26 April and 6 May 1986.
View the animation (Length: 2:30 minutes)
Support Note (PDF - in french)
Ten key data sheets
1. The radioactive particles released during the explosion of the reactor were blown over thousands of kilometers by the wind
2. Air contamination levels were significantly different depending on the geographical area and changed rapidly between 30 April and 5 May 1986
3. The deposition of radioactive particles is enhanced during rainfall
4. Deposition across France, and throughout Europe, is highly uneven
5. Contamination of foodstuffs was determined by the date of the accident and deposition characteristics
6. After deposition, the contamination level of farm produce fell at variable rates
7. Since 1987, the contamination of farm produce has fallen faster than the radioactive decay of caesium
8. Special cases concerning more sensitive products
9. Mean doses received by the French population from the Chernobyl accident were low
10. In France, the issues raised about how the accident affected health concern thyroid cancer
Booklet: Understanding the accident and its consequences
Download the booklet (PDF file, 1.5 Mo)
1. The accident
2. The releases
3. Dispersion of the radioactive plume over Europe
4. Radioactive depositions in Europe
5. Contamination of environments and farm produce
6. Health impact in the most contaminated areas
7. Doses received in France and related risks
8. The site today
9. Lessons learned from Chernobyl
Further information
Final conclusions on the Franco-German initiative (IFA) for Chernobyl launched in 1996
- Safety of the sarcophagus Program 1 (PDF file, 8.7 Mo)
- Study on radioecological consequences Program 2 (PDF file, 6.7 Mo)
- Study on health impacts Program 3 (PDF file, 3.8 Mo)
Information file on the Aurengo mission
In 2002, the Ministers for Health and the Environment asked Professor Aurengo to study the radioactive fallout in France from the Chernobyl accident and its consequences on health.
Download file (PDF file)
Criticisms sent to IPSN concerning the estimated consequences of the Chernobyl accident in France
IRSN/DSDRE/GT Report No. 3 of July 2005
Download file (PDF file)