New Radioisotope of Platinum—Pt200

A new radioisotope of platinum, ${\mathrm{Pt}}^{200}$, with an 11.5-hr half-life has been produced by successive neutron capture in ${\mathrm{Pt}}^{198}$. It was identified by milking its daughter, ${\mathrm{Au}}^{200}$. The activation cross section for the reaction ${\mathrm{Pt}}^{199}(n, \gamma ){\mathrm{Pt}}^{200}$ is approximately 15 barns.