I HAVE recently found that water from deep wells in Cambridge contains a radio-active gas, and I am anxious to see whether water from other sources possesses the same property. I should be greatly obliged if any of your readers who have access to deep level water would fill a clean two-gallon can with it and forward it to the Cavendish Laboratory. I should, of course, pay the carriage and return the can. I may say that I have already had samples of water from Birmingham and Ipswich, each of which contained the gas.
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THOMSON, J. Radio-active Gas from Well Water. Nature 67, 609 (1903). https://doi.org/10.1038/067609c0