Other
Scientific paper
Dec 1946
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1946phrv...70..812j&link_type=abstract
Physical Review, vol. 70, Issue 11-12, pp. 812-814
Other
3
Scientific paper
The soft range of the energy spectrum of 79Au198 was measured by means of a magnetic lens β-ray spectrometer. The part of the spectrogram so obtained shows a part of continuous β-spectrum and a broad line spectrum of secondary β-rays ejected from the L-level of gold by the softest component of non-corpuscular radiation first found by Richardson. The peak of the line spectrum at Hρ=837.5 corresponds to the maximum energy of 58.4 kev of electrons ejected from L-group of gold. The energy of the radiation which might have given rise to these β-rays must be 70.3 kev with a wave-length λ=175.7 x.u. This value of λ is practically identical with the estimated value of the wave-length of Kα1 line of mercury. The breadth and the spread of the line towards the low energy side indicate that the spectrum of the L-group of electrons of gold, ejected by a 70.3-kev energy radiation partly overlaps another line spectrum of the same group of electrons ejected by a radiation, softer than 70.3 kev radiation by an energy of the order of only a few kev. This softer one could be identical with the K-radiation of 78Pt198. The softest component of non-corpuscular radiation found in 79Au198 is therefore very likely composed of the K-radiation of 78Pt198, and the K-radiation of 80Hg198. From the evidence, the radioactive isotope of gold 79Au198 appears to have a dual transition, a transition to 80Hg198 following β-decay and another to 78Pt198, following K-capture as assumed by Sizoo and Eijkman.
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