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Science 15 October 1976:
Vol. 194. no. 4262, pp. 315 - 318
DOI: 10.1126/science.194.4262.315
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Articles

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

ROBERT V. GENTRY 1, WARNER H. CHRISTIE 2, DAVID H. SMITH 2, J. F. EMERY 2, S. A. REYNOLDS 2, RAYMOND WALKER 2, S. S. CRISTY 3, and P. A. GENTRY 4

1 Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
2 Analytical Chemistry Division, Oak Ridge National Laboratory
3 Laboratory Development Division, Y-12 Plant, Oak Ridge National Laboratory
4 Columbia Union College, Takoma Park, Maryland 20012

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.

Submitted on September 15, 1975
Revised on June 30, 1976


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Science. ISSN 0036-8075 (print), 1095-9203 (online)