Analysis of sediment samples for cesium-137 from a wide range of posit
ions has demonstrated an uneven distribution. The pathways and the pos
sible origin of the radionuclide are discussed. The importance of sedi
mentation processes for the distribution pattern is demonstrated. The
mean values of the upper centimetre of the bottom sediment are between
non-detectable and 8 Bq . kg(-1) (dry). (C) 1997 International Counci
l for the Exploration of the Sea.