The Isotopic Constitution of Scandium, Gadolinium, Dysprosium, Holmium, Erbium, and Ytterbium

The relative abundances of the isotopes of scandium, gadolinium, dysprosium, holmium, erbium, and ytterbium have been redetermined with a mass spectrometer incorporating an electron multiplier to give increased sensitivity. No new isotopes were found although special attention was devoted to this problem and low upper limits were set for nearly all possible isotopes.