Abstract
As described in a previous communication,1 we have found from the hyperfine structure of the lead spectrum that the ordinary element contains, in addition to Pb208, Pb206, and Pb207, a fourth isotope, Pb204, with an intensity of 1 per cent. Owing to the presence of mercury (particularly Hg204) in the discharge, the first analysis of lead by means of the mass spectrograph could not detect this new isotope. Recently, Aston2 has repeated his analysis and reported Pb204, together with four other weaker isotopes (209, 203, 205, and 210).
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References
H. Schüler and E. G. Jones, Naturwiss, 20, 171; 1932.
F. W. Aston, Nature, 129, 649; April 30, 1932.
H. Schüler and J. E. Keyston, Z. Phys., 70, 1; 1931; confirmed By F. W. Aston, NATURE, 128, 725, Oct. 24, 1931.
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SCHULER, H., JONES, E. Isotopic Constitution of Lead. Nature 129, 833–834 (1932). https://doi.org/10.1038/129833d0
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DOI: https://doi.org/10.1038/129833d0
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