The tin isotope which decays with a 14-day half-life by an isomeric transition is definitely assigned to mass number 117. It was produced by the reactions ${\mathrm{Cd}}^{114}(\alpha ,n)$, ${\mathrm{Sn}}^{116}\mathrm{}(d,p)\mathrm{}$, ${\mathrm{Sn}}^{118}(n^f,2n)$, and ${\mathrm{Sn}}^{117}(n^f,n)$; and by the decay of indium 117 which is produced by the reaction ${\mathrm{Cd}}^{116}\mathrm{}(d,n)\mathrm{}$. The cross section of the reaction ${\mathrm{Sn}}^{117}(n^f,n)$ is about 1.8 times larger than the cross section of the reaction ${\mathrm{Sn}}^{118}(n^f,2n)$. Characteristic radiations are $K$ and $L$ conversion electrons of 0.146-Mev and 0.171-Mev energy, respectively, tin x-rays, and 0.175-Mev gamma-rays which are about 50 percent internally converted.

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