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Science 20 August 1971:
Vol. 173. no. 3998, pp. 727 - 731
DOI: 10.1126/science.173.3998.727
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Articles

Radiohalos: Some Unique Lead Isotope Ratios and Unknown Alpha Radioactivity

Robert V. Gentry 1

1 Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

Previously unreported lead isotope ratios, that is, values for the lead-206/lead-207 ratio ranging from about 20 to 60, primarily radiogenic in origin but unsupported by uranium decay, have been determined in the inclusions of certain polonium halos by means of ion microprobe techniques. Evidence for radiogenic lead-208 unsupported by thorium decay may also be inferred from the existence of a composite polonium halo type with rings from the radioactive precursors of lead-208. Several new dwarf halo sizes, seem to indicate the existence of unknown, very low-energy alpha-emitters. Furthermore, the three-ring "X halo" also provides evidence for an unknown series of genetically related alpha-emitters with energies in the range from 3 to 7 million electron volts.


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