Reports

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

Science  15 Oct 1976:
Vol. 194, Issue 4262, pp. 315-318
DOI: 10.1126/science.194.4262.315

Abstract

The discovery of embryonic halos around uranium-rich sites that exhibit very high 238U/206Pb ratios suggests that uranium introduction may have occurred far more recently than previously supposed. The discovery of 210Po 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.

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