Measurements of dry deposition rates of 212Pb from aerosols on various natural and artificial surfaces

The dry deposition rates on various grass fields and two forests have been measured by the use of Pb-212 (T-1/2 = 10.6 hours). The deposition rate on grass fields (average: 7 mm(.)s(-1)) roughly depends on the logarithms of the heights or densities of the grasses. The dry deposition rates on a broadleaved forest (Lithocarpus edulis) and a coniferous forest (Cryptomeria Japonica) were also measured. The highest (ave. 26 mm(.)s(-1)) was on the forest of C. Japonica because of the dense and adhesive surfaces of the leaves.