Abstract
Estimates of the atmospheric 210Pb flux can be made from old (∼ 100 years) soil profiles because of the strong retention of this nuclide in the organic rich surface layers. Correction for radon loss can be made by modeling the observed 210Pb and 226Ra profiles. This is shown to have only a small effect for most of the soils studied. Comparison of soil‐based 210Pb fluxes with other estimates indicates good agreement except in the forested montane region of eastern New Mexico; the high 210Pb content of soils there remains to be explained.
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