Radiohalos in Coalified Wood: New Evidence Relating to the Time of Uranium Introduction and Coalification

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Abstract
The discovery of embryonic halos around uranium-rich sites that exhibit very high 238 U/ 206 Pb ratios suggests that uranium introduction may have occurred far more recently than previously supposed. The discovery of 210 Po halos derived from uranium daughters, some elliptical in shape, further suggests that uranium-daughter infiltration occurred prior to coalification when the radionuclide transport rate was relatively high and the matrix still plastically deformable.