Abstract
The natural isotopic abundances of the following elements have been determind with Hitachi Mass Spectro meters. Lithium, Magnesium, Potassium, Calcium, Chromium, Rubidium, Strontium, Molybdenum, Barium, Tungsten, and Uranium. Ions except tungsten and molybdenum were produced by thermionic evaporation from the samples on tungsten, platinum and molybdenum filaments. In cases of tungsten and molebdenum, their ions were obtained from tungsten and molybdenum filaments themselves. Reasonable isotopic abundances were obtained in the experiment.
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