<page_title> Nuclear fission product </page_title> <section_title> Health concerns </section_title> <table> <cell> Strontium-90/yttrium-90 <col_header> Isotope </col_header> </cell> <cell> Cesium-137 <col_header> Isotope </col_header> </cell> </table>
⁹⁰Sr and ¹³⁷Cs are the radioisotopes.