Abstract
Isotopic abundances of germanium were determined by secondary ion mass spectrometry. A pellet of 99.999% pure germanium was used as a sample. It was bombarded by 12 keV oxygen primary ion beam whose diameter and current were 70-100 μm and 1-5×10-7 A on the sample surface. The isotopic ratios obtained are 70Ge/74Ge=0.58303±0.00033, 72Ge/74Ge=0.76341±0.00028, 73Ge/74Ge=0.21458±0.00013 and 76Ge/74Ge=0.20771±0.00011. The isotopic abundances determined are 70Ge: 21.058±0.012, 72Ge: 27.573±0.011, 73Ge: 7.750±0.005, 74Ge: 36.118±0.006, and 76Ge: 7.502±0.004 in percent.
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