Estimates of the atmospheric 210 Pb 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 210 Pb and 226 Ra profiles. This is shown to have only a small effect for most of the soils studied. Comparison of soil‐based 210 Pb fluxes with other estimates indicates good agreement except in the forested montane region of eastern New Mexico; the high 210 Pb content of soils there remains to be explained.
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Nozaki et al. (1978) studied this question.
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