Natural U consists of two radioactive parent-isotopes, 238U and 235U, the half-lives of which fall into the range of geologic time. Outside this range is the half-life of 232Th, which represents the only natural isotope of Th.
CITATION STYLE
Gebauer, D., & Grünenfelder, M. (1979). U—Th—Pb Dating of Minerals. In Lectures in Isotope Geology (pp. 105–131). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-67161-6_7
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