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Robert Gentry

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Dr. Robert V. Gentry is a nuclear physicist who worked 13 years for the Oakridge National Laboratory ('69-'82). He has spent the major part of his scientific career investigating traces of polonium radioactivity inscribed in granite and is arguably the world's leading authority on polonium halos. His research has resulted in authoring or co-authoring over twenty research papers in scientific publications, such as Science, Nature, Geophysical Research Letters, Annual Review of Nuclear Science, and Earth and Planetary Science Letters. When he began his research, he was an evolutionist. Today, Dr. Gentry is a fully convinced young earth creation scientist.

Gentry's work showed that granite was never in a molten condition, because polonium pleochroic halos survive only in solid rock and the half-life of polonium is much too short to survive a multimillion-year cooling time. His results seem to indicate that the Earth was created instantaneously, in a cool condition. If true, it is clear evidence for creation. Gentry documents his evidence in his book, Creation's Tiny Mystery. The book contains copies of Gentry's reports in scientific journals and an intriguing narrative about the scientific community's response to his published findings.

Robert Gentry
Earth Science Associates
Box 12067
Knoxville, TN 37912-0067



Publication in secular journals

  • Gentry, Robert V. 1968. Fossil Alpha Recoil Analysis of Variant Radioactive Halos. Science 160, pp. 1228-1230.
  • Gentry. Robert V. 1971. Radiohalos: Some Unique Pb Isotope Ratios and Unknown Alpha Radio Activity. Science 173, pp. 727-31.
  • Gentry, Robert V. 1973. Radioactive Halos. Ann. Rev. Nuc. Sci, 23, pp. 347-362.
  • Gentry, Robert V. 1974. Radiohalos in a Radiochronological and Cosmological Perspective. Science 184, pp. 64-66.
  • Gentry, Robert V. 1975. Response to J.H. Fremlin’s Comments on "Spectacle Haloes." Nature 258, p. 269.
  • Gentry, Robert V. 1979. Time: Measured Responses. Eos 60, p. 474.
  • Gentry, Robert V. 1984. Radiohalos in a Radiochronological and Cosmological Perspective. Proceedings of the Sixty Third Annual Meeting of the Pacific Division, American Association for the Advancement of Science, Volume 1. Part 3. pp. 38-65.
  • Gentry, Robert V. et al.. 1973. Ion Microprobe Confirmation of Pb Isotope Ratios and Search for Isomer Precursors in Polonium Radiohaloes. Nature 244, pp. 282-283.
  • Gentry, Robert V. et al.. 1974. "Spectacle" Array of 210Po Halo Radiocentres in Biotite: A Nuclear Geophysical Enigma. Nature 252, p. 564.
  • Gentry, Robert V. et al.. 1976. Radiohalos in Coalified Wood: New Evidence Relating to the Time of Uranium Introduction and Coalification. Science 194, pp. 315-318.
  • Gentry, Robert V. et al.., 1982a. Differential Lead Retention in Zircons: Implications for Nuclear Waste Containment. Science 2l6, pp. 296-298.
  • Gentry, Robert V., Clish, Gary L., and McBay, Eddie H. 1982b. Differential Helium Retention in Zircons: Implications for Nuclear Waste Containment. Geophys. Res. Lett. 9, pp. 1129-1130.


See Also