<page_title> Isotopes of dubnium </page_title> <section_title> Chronology of isotope discovery </section_title> <table> <cell> 260Db <col_header> Isotope </col_header> </cell> <cell> 1970 <col_header> Year discovered </col_header> </cell> <cell> 249Cf(15N,4n) <col_header> discovery reaction </col_header> </cell> </table>
The isotope ²⁶⁰Db was discovered from ²⁴⁹Cf(¹⁵N,xn)264−xDb (x=4) in 1970.