[en] Two ocean profiles from the Peru Basin from regions with different surface productivities were analyzed for total ²¹⁰Pb and ²¹⁰Po to evaluate the influence of particulates in the water column on their distribution. Comparison with a published ²²⁶Ra profile for the region was made. The profile closest to the coast, where upwelling and productivity are high, shows depletion of ²¹⁰Pb relative to ²²⁶Ra at all depths, with particularly marked excursions from radioactive equilibrium at the surface and in the bottom water. ²¹⁰Po appears to be deficient relative to ²¹⁰Pb at depth as well. Mean residence times in the deep water, relative to particulate removal from the water column to the sediments, of about 100 years for ²¹⁰Pb and about two years for ²¹⁰Po are indicated. The profile northwest of the upwelling region shows the ²²⁶Ra-²¹⁰Pb-²¹⁰Po system close to equilibrium at all depths to 1500 m (except for the effect of atmospheric ²¹⁰Pb input seen at the surface). (Auth.)