Map of césium marine pollution after Tchernobyl
This map shows the distribution in 1988 of the cesium-134 activity in the North Sea, two years after the Chernobyl accident. This radioactive cesium isotope is a beta and gamma emitter and has a two-years half-life. Cesium-134 was chosen here to monitor the radioactive pollution of cesium in the Nortn Sea diffused by water currents. The south coast of Norway was the most affected.