Comparison of 210Po/210Pb activity ratio between aerosol and deposition in the atmospheric boundary layer over the west coast of Japan

Toshitaka Suzuki, Hideki Shiono
1995 Geochemical Journal  
Atmospheric bulk deposition and aerosol samples were collected simultaneously in the surface air over the west coast of Japan (38°46' N, 139°44' E), and analyzed for 210Pb. By coupling data with those pre viously reported for 210Po (Suzuki, 1994) , the following results have been obtained. (1) The 210po/210Pb activity ratios in aerosols were consistently larger than those in atmospheric depositions, and (2) the activity ratios in April were larger than those in July and October in both aerosol
more » ... er in both aerosol and deposition samples. The results can be variously attributed to the difference of residence time between atmospheric suspending and settling particles, and the difference of contribution from various sources in which 210Pb and 210Po are in over-, under or secular-equilibrium.
doi:10.2343/geochemj.29.287 fatcat:gkzna5co4bf4rasqclxhgvozbi