Abstract
THE atomic masses of doubly charged thorium 232, and of uranium 238, have been determined by Prof. A. J. Dempster with the mass-spectrograph, by comparison with the isotopes 116 and 119 of tin (having the same mass-charge ratio). The presence of 0 -4 per cent of a stable uranium isotope of mass 235 was also found, and since a radioactive uranium isotope of mass 235 and of half-life 24 hours is already known, Prof. Dempster concludes that the two isotopes, having the same mass and charge, are isomers differing in nuclear properties.
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Points from Foregoing Letters. Nature 138, 128 (1936). https://doi.org/10.1038/138128b0
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DOI: https://doi.org/10.1038/138128b0