This map presents the deposition of caesium-134 and caesium-137 following the Chernobyl reactor accident. Deposition rates varied strongly, depending on the amount of precipitation. The additional deposition of the more relevant caesium-137 ranges from 860 to about 5,600 Bq/m² at the individual measurement points; newly introduced caesium-134 varies between 430 and 2,600 Bq/m². More information