Abstract
I HAVE now succeeded in obtaining and analysing the mass-rays of cadmium, tellurium, and bismuth. By the use of an anode containing cadmium fluoride, rays were obtained which, though feeble, gave satisfactory results with long exposures and the most highly sensitised schumannised plates. Cadmium is a very complex element, having six isotopes: 110 (c), 111 (e), 112 (b), 113 (d), 114 (a), 116 (f). The last is isobaric with the lightest isotope of tin. The intensities of the lines are in the order of the letters and agree reasonably with the chemical atomic weight 112.41. The most striking characteristic of the group is its remarkable similarity to that of tin. If we except the heaviest isotope of tin (124), which does not seem to have its counterpart in cadmium, the intensity relations between the isotopes of the two elements appear almost identical. This is a most suggestive fact and may have a deep significance in connexion with the relative stability of the nuclei of isotopes. The plates are not very favourable for accurate determinations of masses, but these seem integral with that of iodine.
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ASTON, F. The Mass-spectra of Cadmium, Tellurium, and Bismuth. Nature 114, 717 (1924). https://doi.org/10.1038/114717b0
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DOI: https://doi.org/10.1038/114717b0
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