Erbium163andThulium165

A 75-minute activity produced by bombarding ${\mathrm{Ho}}^{165}$ with protons is assigned to ${\mathrm{Er}}^{163}$. A 24.5-hour activity produced by proton bombardment of erbium is assigned to ${\mathrm{Tm}}^{165}$. Gamma-ray spectra are given for both isotopes.