Geographical redistribution of radionuclides in forest and wetland
Publish date: 2001-03-08
Report number: FOA-R--00-01756-861
Pages: 22
Written in: English
Abstract
This report summarizes the results from a survey concerning the presence of caesium-137 in soil in two different areas, Verkmyrån in Gästrikland and Nyänget in Västerbotten. This has been done with a portable NaI gamma spectrometer connected to a GPS, called "backpack". Soil samples have also been taken in the two areas to compare the results from these with the backpack measurements. The results from a survey of caesium-137 1989 in Nyänget has also been included to see if there has been a redistribution of Cs-137 in the area in the last ten years. At Verkmyrån 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 Nyänget 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.