Letter | Published:

Radioactivity Induced by Neutron Bombardment



USING neutron sources containing up to 250 mil-licuries of radon mixed with beryllium, we have been able to confirm many of the results reported by Fermi and his collaborators1. We have also obtained the following additional results: Fluorine appears to give an effect of about 40 sec. period, which has an initial intensity of about 5 per cent of that of the shorter period already reported by Fermi.

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  1. 1

    Fermi and others, La Ricerca Scientifica, 5, 1, 283, 330, 452, and 652: 1934. 2, 21; 1934. NATURE, 133, 757, May 19, 1934.

  2. 2

    L. Meitner, Naturwiss, 22, 420; 1934.

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