The concentration levels of Chernobyl fallout on different surfaces in Gaevle in Sweden

In order to identify some of the parameters necessary for calculations of dose-rate to the population of a radioactively contaminated urban area, some in situ measurements of radioactivity on external urban surfaces were carried out in August 1988 in the town of Gaevle in Sweden. The town was contaminated mainly by wet deposition from the first cloud from the Chernobyl accident on April 28, 1986. The measurements showed the distribution of the contaminant radiocaesium to be dependent on both the nature and orientation of the urban surfaces. The levels found on walls were 0.5-2% of those found on grassed areas whereas on roads, pavements and car parks the figure varied from 1 to 10%. (orig.)