Abstract
EXPERIMENTS on the Fermi effect with some rarer elements have given the results summarised below. The neutrons were obtained from sources of radon, in quantities up to 100 millicuries, sealed in small glass tubes with powdered beryllium, and the radioactivity produced was measured with a Geiger-Müller counter which had been carefully calibrated with weighed amounts of uranium oxide. To utilise the enhanced activity produced by surrounding source and specimen with hydrogen compounds1 most of the irradiations were carried out in a cavity in the middle of a large block of paraffin wax. The main results obtained are collected in the following table.
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References
Fermi et al., Ric. Scient., V, 2, 7–8; 1934.
Fermi, D'Agostino, Amaldi, Pontecorvo and Segré, ibid., Jan. 1935.
Marsh, J. Chem. Soc., 1972; 1934.
Hevesy, NATURE, 135, 96; Jan. 19, 1935.
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SUGDEN, S. Radioactivity of some Rarer Elements produced by Neutron Bombardment. Nature 135, 469 (1935). https://doi.org/10.1038/135469a0
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DOI: https://doi.org/10.1038/135469a0
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