Some observations on seasonal variation of radio-Cesium contamination in trout (Salmo trutta L.) and arctic char (Salvelinus alpinus (L.)) in a Norwegian lake after the Chernobyl fall-out

Abstract

This study of radioactive contamination in freshwater fish shows a clear dependence to seasonal feeding habits. The mechanism of radioactivity storage in the fish body seems to be selected to concern mainly radio-Cesium (strontium content not explored). The biological half-life of this element is estimated to be in the order of one to one and a half month. The fall-out particles must have a faster rate of sedimentation than earlier expected.