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===Thorium-233===
'''<sup>233</sup>Th''' is an isotope of [[thorium]] that decays into [[protactinium-233]] through beta decay. It has a half-life of 21.83 minutes.<ref name="NUBASE">{{cite journal| first = Audi| last = Georges|title = The NUBASE Evaluation of Nuclear and Decay Properties| journal = Nuclear Physics A| volume = 729| issue = 1| pages = 3–128| publisher = Atomic Mass Data Center| year = 2003| doi=10.1016/j.nuclphysa.2003.11.001| bibcode=2003NuPhA.729....3A| url = http://hal.in2p3.fr/in2p3-00014184/file/democrite-00014184.pdf}}</ref> Traces occur in nature as the result of natural [[neutron activation]] of <sup>232</sup>Th.<ref name=4n1>{{cite journal |last1=Peppard |first1=D. F. |last2=Mason |first2=G. W. |last3=Gray |first3=P. R. |last4=Mech |first4=J. F. |title=Occurrence of the (4n + 1) series in nature |journal=Journal of the American Chemical Society |date=1952 |volume=74 |issue=23 |pages=6081–6084 |doi=10.1021/ja01143a074 |url=https://digital.library.unt.edu/ark:/67531/metadc172698/m2/1/high_res_d/metadc172698.pdf |archive-url=https://web.archive.org/web/20190429182951/https://digital.library.unt.edu/ark:/67531/metadc172698/m2/1/high_res_d/metadc172698.pdf |archive-date=2019-04-29 |url-status=live }}</ref>
===Thorium-234===
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