Deposition of Caesium to Surfaces of Buildings

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Abstract
Outdoor surfaces of several different types of building material have been analysed for 134Cs and 137Cs and the results used to estimate deposition velocities using integrated air doses. The Chernobyl reactor accident would have been the only significant source of 134Cs and, for materials unlikely to have intercepted precipitation during the passage of the main plume, dry deposition velocities have been inferred. Substantial amounts of 137Cs on the older building materials would have been due to nuclear weapons fall-out. For brick walls, 134Cs levels were below the limits of analytical detection and upper limits of dry deposition velocity have been estimated. Values have also been inferred for roofing felt and flat clay and corrugated concrete roof tiles. 137Cs levels on older roofing materials indicate significant weathering of weapons fall-out.

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