Abstract
IN the course of some experiments on the chemical behaviour of the and rays from radium (Ramsay and Cooke, NATURE, August 11) solutions were obtained containing a radio-active substance which could sometimes be removed from the solution by the formation in it of a suitable precipitate. Sometimes when such a solution, containing ammonium salts, and in which several precipitations had already taken place, was evaporated to dryness on the lid of a porcelain crucible the residue was found to be capable of lessening the rate of leak of the electroscope, i.e. it behaved in the opposite way to an active residue, which would increase the rate of leak. This “anti-activity” has been observed on several occasions, and seems to be a specific property of the matter examined, and not to be due to any variable condition of the electroscope; thus the natural leak taken before is the same as that taken immediately after such an experiment.
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COOKE, W. Note on Radio-activity. Nature 71, 176 (1904). https://doi.org/10.1038/071176a0
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DOI: https://doi.org/10.1038/071176a0
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