<page_title> Isotopes of thorium </page_title> <section_title> List of isotopes </section_title> <table> <cell> 233Th <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 21.83(4) min <col_header> half-life </col_header> </cell> </table>
233Th has a half-life of 21.83 minutes.