<page_title> Isotopes of lutetium </page_title> <section_title> List of isotopes </section_title> <table> <cell> 173Lu <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 1.37(1) y <col_header> half-life </col_header> </cell> <cell> 174Lu <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 3.31(5) y <col_header> half-life </col_header> </cell> </table>
¹⁷⁴Lu with a half-life of 3.31 years and ¹⁷³Lu with a half-life of 1.37 years.