Abstract
KLEMPERER1 has recently shown that 19K40 is very probably the source of the natural -radioactivity of potassium. This supports the suggestion put forward by the authors2 based on Fermi's failure to observe induced -radioactivity when calcium is bombarded with neutrons. Klemperer also suggested that 37Rb86 is similarly the source of the natural -radioactivity of rubidium. The effects observed when rubidium, yttrium and strontium are bombarded with neutrons support this suggestion as follows.
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References
Klemperer, Proc. Roy. Soc., A, 148, 638; 1935.
Newman and Walke, NATURE, 135, 98, Jan. 19, 1935.
Hevesy, NATURE, 135, 96, Jan. 19, 1935.
Fermi, Amaldi, D'Agostino, Rasetti and Segré, Proc. Roy. Soc., A, 146, 483; 1934.
Szilard and Chalmers, NATURE, 135, 98, Jan. 19, 1935.
v. Gross and Agruss, Phys. Rev., 46, 241; 1934.
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NEWMAN, F., WALKE, H. Radioactivity of Rubidium. Nature 135, 508 (1935). https://doi.org/10.1038/135508a0
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DOI: https://doi.org/10.1038/135508a0
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