Radionuclide ratios in wet and dry deposition samples from June 1976 through December 1977

238Pu, 239Pu and 137Cs in rain and dry fallout and 90Sr in rain samples were measured at Woods Hole, Massachusetts, from June 1976 through December 1977. The dry fallout was estimated to be about 7.8% of the total deposition of 239Pu and 137Cs. 239Pu/137Cs ratios, almost constant at about 0.011 in rain or dry fallout, February through December 1977, suggested that fractionation between the refractory and volatile radionuclides is insignificant in stratospheric fallout. This supports the idea of regional homogeneity of radionuclide ratios in fallout. (Auth.)