Geographical redistribution of radionuclides in forest and wetland

This report summarizes the results from a survey concerning the presence of caesium-137 in soil in two different areas, Verkmyraan in Gaestrikland and Nyaenget in Vaesterbotten. This has been done with a portable NaI gamma spectrometer connected to a GPS, called back pack. Soil samples have also been taken in the two areas to compare the results from these with the back pack measurements. The results from a survey of Cesium-137 1989 in Nyaenget has also been included to see if there has been a redistribution of Cs-137 in the area in the last ten years. At Verkmyraan there is an increase in Cs-137 deposition at the lower part of the catchment which probably depends on a transport of Cs-137 to the outflow. In Nyaenget the results show a possible levelling of the Cs-137 activity between the different soil types, but to verify that, more soil samples must be taken and analysed