Other
Scientific paper
Oct 1927
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1927natur.120..545r&link_type=abstract
Nature, Volume 120, Issue 3024, pp. 545-546 (1927).
Other
Scientific paper
SOME years ago, Prof. Joly (Proc. Roy. Soc., A, 102, 682; 1923) discovered radioactive haloes which could not be ascribed to any known radioactive product. One class, not unlike thorium haloes, he called X-haloes; asecond class, of radii less than those of other haloes, he called `hibernium' haloes, hibernium being the suggested name for the new radioelement causing the halo. Recently, S. Iimori and J. Yoshimura(Sci. Papers Inst. Phys. Ghem. Res. Tokyo, 5, 11; 1926) have found a class of haloes not unlike X-haloes which they call Z-haloes. They suggest that the X-haloes and possibly the haloes ascribed by Prof. Joly to radon are identical with these, and that they are due to products of the actinium series. Z-Haloes have some times two inner rings smaller in radius than any caused by a known radioactive product, and these they ascribe to two uranium isotopes at the head of the actinium series with half-value periods of the orders of 1012 and 1023 years. They also state that their work on Z-haloes definitely establishes that the actinium series originates independently of the uranium series.
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