${\mathrm{Ag}}^{105}$: An activity with a half-life of 40 days, has been produced by the following reactions: $\mathrm{Rh}(\alpha ,2n)$, $\mathrm{Pd}(\alpha ,p)$, $\mathrm{Pd}\mathrm{}(d,2n)\mathrm{}$ and $\mathrm{Pd}\mathrm{}(p,n)\mathrm{}$. This activity decays by $K$-electron capture only.

${\mathrm{Ag}}^{110}$: An activity with a half-life of 270 days previously reported as 225 days, has been produced by $\mathrm{Pd}\mathrm{}(d,2n)\mathrm{}$ and ${\mathrm{Ag}}^{109}\mathrm{}(d,p)\mathrm{}$ reactions.

${\mathrm{Cd}}^{105}$: An activity with a half-life of 57 minutes has been produced by the $\mathrm{Cd}\mathrm{}(n,2n)\mathrm{}$ and $\mathrm{Pd}(\alpha ,n)$ reactions. Decay is accompanied by a 1.5-Mev positron and $K$-capture.

${\mathrm{Cd}}^{109}$: An activity with a half-life of 470 days, previously reported as 330 days, has been produced by the $\mathrm{Ag}\mathrm{}(d,2n)\mathrm{}$ and $\mathrm{Pd}(\alpha ,n)$ reactions.

• Received 20 June 1950

DOI:https://doi.org/10.1103/PhysRev.80.315