Neutron-Deficient Activities of Holmium

Proton bombardment of pure oxides of Dy, Ho, and Er has served to clear up some uncertainties concerning neutron-deficient activities of Ho. Two previously reported activities, 5.2 day and 65 day, were not found, and reassignment of the 5.0-hour activity to a mass of 162 is made. The gamma-ray spectrum of the 5.0-hour activity shows it to decay by electron capture with gamma energies of 0.19, 0.71, and 0.95 Mev. 41-minute ${\mathrm{Ho}}^{164}$ is shown to decay by electron capture and by ${\beta }^{-}$ emission.