<page_title> Isotopes of tin </page_title> <section_title> List of isotopes </section_title> <table> <cell> 121m1Sn <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 43.9(5) y <col_header> half-life </col_header> </cell> </table>
Tin-121m has a half-life of 43.9 years.