. The interpretation of radium and the structure of the atom . e experimentfor himself. Fig. 2 (facing p. 7) shows the result I obtained witha very thin piece of aluminium foil between the film andthe mantle. The foil, while quite opaque, allows thea- as well as the /S-rays to go through. Paper wouldstop the a-rays entirely. The radioactivity of thorium, though producing thesame general effects as that of uranium, differs fromit entirely in detail. Indeed, by a few simple testson the radioactivity, any one of the radioactiveelements can be recognised and distinguished farmore quickly and certa
. The interpretation of radium and the structure of the atom . e experimentfor himself. Fig. 2 (facing p. 7) shows the result I obtained witha very thin piece of aluminium foil between the film andthe mantle. The foil, while quite opaque, allows thea- as well as the /S-rays to go through. Paper wouldstop the a-rays entirely. The radioactivity of thorium, though producing thesame general effects as that of uranium, differs fromit entirely in detail. Indeed, by a few simple testson the radioactivity, any one of the radioactiveelements can be recognised and distinguished farmore quickly and certainly than by any of the otherchemical or spectroscopic tests, even when presentin very minute quantities. In the historical develop-ment of the views now held in radioactivity thoriumplayed a leading part. But, as it is quite foreign tomy intention to give anything approaching a detailedsystematic account of the subject, and as radium lends 1 The cause of the action of the gas-mantle in generating light isquite unconnected with the property of
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradioac, bookyear1922
