Cesium in Europe after Chernobyl
In 1986, the activity of the cesium-137 released by the Chernobyl accident added to the residue of the impact of atmospheric nuclear tests. The map shows contamination about 1000 times higher near Chernobyl compared to western Europe because of distance. Globally the amount of Chernobyl releases totaled about three times the residual activity in 1986 of the nuclear tests.
IRSN