Radioactivity in Soils (Cesium-134 and Cesium-137) 1991

This map presents the spatial distribution of caesium-137 calculated for the topsoil prior to the Chernobyl reactor accident. The mean of all calculated single values is about 1,300 Bq/m². More information

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

The total contamination (old and newly introduced) calculated for 1 May 1987 demonstrates that the activity rate of caesium-134 is down to 75 % compared to the initial contamination. More information

The progression of radioactive decay of the tested isotopes reflects the calculations for 1 May 1991. For caesium-134, the surface activity is only just under 20 % of the initial contamination, while the level of caesium-137 has only decreased by about 7.5 % compared to when it was newly introduced. More information