Abstract
Absolute isotopic abundances of europium in 12 samples from various origins were determined by using thermal ionization mass spectrometry. For this purpose, synthetic mixtures of independently known isotopic compositions prepared from chemically pure and nearly isotopically pure separated europium isotopes served to calibrate the mass spectrometer. The resulting true 151Eu/ 153Eu ratio is 0.90673 ± 0.00235, which yields the mean isotopic abundances (47.554 ± 0.065) at.% 151Eu and (52.446 ± 0.065) at.% 153Eu at the 95% confidence limit. From these data and the relevant nuclidic masses the atomic weight of europium was calculated to be 151.9695 ± 0.0013.
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