Abstract
IN the course of some experiments that have been recently carried out in the physical laboratory at Toronto on the natural conductivity of air confined in vessels made of different metals, a wide variation was observed in the results obtained with different samples of lead. The lowest conductivity observed with air enclosed by this metal corresponded to an average production of 23 ions per c.c. per second, and the highest to a production of 160 ions per c.c. per second. The lowest value hitherto recorded for lead appears to be that quoted by Eve in his paper in the Phil. Mag. of September, 1906, in which he gives 96 ions per c.c. per second as the number he obtained with this metal. The sample of lead which exhibited the low activity just referred to was a sheet which had been used as a lining in, a case in the laboratory for nearly thirty years.
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MCLENNAN, J. The Radio-activity of Lead and other Metals. Nature 76, 248 (1907). https://doi.org/10.1038/076248a0
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DOI: https://doi.org/10.1038/076248a0
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