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Radioactivity of In 117 and Sb 117

1955; American Institute of Physics; Volume: 97; Issue: 1 Linguagem: Inglês

10.1103/physrev.97.93

1536-6065

C. L. McGinnis,

Thermodynamic and Structural Properties of Metals and Alloys

The ${p}_{\frac{1}{2}}$ isomeric level of ${\mathrm{In}}^{117}$ decays with a 1.9-hr half-life 49 percent by a 1.777-Mev ${\ensuremath{\beta}}^{\ensuremath{-}}$ to the ${s}_{\frac{1}{2}}$ ground state of ${\mathrm{Sn}}^{117}$, 23 percent by a 1.616-Mev ${\ensuremath{\beta}}^{\ensuremath{-}}$ to the 0.161-Mev ${d}_{\frac{3}{2}}$ level of ${\mathrm{Sn}}^{117}$, and 28 percent by an $M4$ 0.311-Mev $\ensuremath{\gamma}$ to the ${g}_{\frac{9}{2}}$ ground state of ${\mathrm{In}}^{117}$. The latter decays with a 1.1-hr half-life by a 0.740-Mev ${\ensuremath{\beta}}^{\ensuremath{-}}$ to the ${g}_{\frac{7}{2}}$ level of ${\mathrm{Sn}}^{117}$ which is de-excited by a 0.565-Mev $\ensuremath{\gamma}$ and a 0.161-Mev $\ensuremath{\gamma}$ in cascade. There is no cross-over $\ensuremath{\gamma}$ (1 percent). Less than 10 percent of the 3.0-hr ${\mathrm{Cd}}^{117}$ decays to the 1.9-hr level. Less than 1 percent of the 1.1-hr ground state populates the 14-day ${\mathrm{Sn}}^{117m}$. The 2.8-hr ${\mathrm{Sb}}^{117}$ decays to the 0.161-Mev level of ${\mathrm{Sn}}^{117}$ by a 0.61-Mev ${\ensuremath{\beta}}^{+}(\frac{{\ensuremath{\beta}}^{+}}{\ensuremath{\epsilon}}=0.026)$ but does not decay to the 0.323- or 0.726-Mev levels (0.5 percent).