. Radioactive transformations . d. Ramsay and Soddy 1 attacked the difficult prob-lem of isolating the emanation and determiningits volume in the following way. The emanationfrom 60 milligrams of radium bromide in solu-tion was collected for 8 days,and then drawn off throughthe inverted siphon, E (seeFig. 22), into the explosionburette, F. The radium inthe solution produces hydro-gen and oxygen at a rapidrate, and the emanation wasinitially removed with thesegases. After explosion, theslight excess of hydrogenmixed with the emanation wasleft for some time in contactwith caustic soda, placed in
. Radioactive transformations . d. Ramsay and Soddy 1 attacked the difficult prob-lem of isolating the emanation and determiningits volume in the following way. The emanationfrom 60 milligrams of radium bromide in solu-tion was collected for 8 days,and then drawn off throughthe inverted siphon, E (seeFig. 22), into the explosionburette, F. The radium inthe solution produces hydro-gen and oxygen at a rapidrate, and the emanation wasinitially removed with thesegases. After explosion, theslight excess of hydrogenmixed with the emanation wasleft for some time in contactwith caustic soda, placed inthe upper part of the burette,in order to remove the car-bon dioxide present. In themeantime, the upper part ofthe apparatus had been ex-hausted as completely as possi-ble. The connection with themercury pump was then closed,and the hydrogen and ema-nation allowed to enter the apparatus, passing over a phos-phorus pentoxide tube, D, to remove all trace of water vapor. 1 Ramsay and Soddy : Proc. Roy. Soc, lxxiii., p. 346 (1904).. Fig. 22. Apparatus of Ramsay and Soddy for determining the volume of the radium emanation. 88 RADIOACTIVE TRANSFORMATIONS The emanation was condensed in the lower part of the tube B,which was surrounded by liquid air. The process of condensa-tion of the emanation at B was made evident by the brilliantluminosity of the lower part of the tube. The mercury of theburette was allowed to run to A, and the tube AB again com-pletely pumped out. The connection with the pump was againclosed, the liquid was removed, and the volatilized emanationforced into the accurately calibrated capillary tube A. Obser-vations were then made for a space of several weeks on thevariation in volume of the emanation. The results are shownin the following table: Time. Volume. Time. Volume. Start 7 days 1 day 9 3 11 « 4 12 « 6 The volume decreased, and after four weeks only a minutebubble remained, but this r
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