Abstract
FROM observations made by Simpson and Wright, the writer, and others, it is now known that the ionisation in air confined in airtight clean zinc vessels is about 8 or 9 ions per c.c. per second when the observations are made on land where the soil contains only such minute traces of radio-active substances as are found in ordinary clays or loams.
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MCLENNAN, J. Residual lonisation in Gases. Nature 92, 424 (1913). https://doi.org/10.1038/092424a0
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DOI: https://doi.org/10.1038/092424a0
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