. Technical paper. seahng the orein a very thin bulb, of the type shown in figure 1, for a month ormore before breaking under acid to liberate the total emanation. EMANATION METHOD FOR DETERMINATION OF RADIUM. 13 The bulb a, of 4 to 10 mm. diameter, according to the ({uantity ofore to be used, is blo\vii very thin so as to break without endangeringthe outer flask /, contain- fl CAF!N0T/TE I BURETTEf ing HXO3. The ore isweighed into the bulbthrough h and then theglass stem c is sealed onand is constricted to makea complete seal at (Z, theupper end e being alsosealed for whole is
. Technical paper. seahng the orein a very thin bulb, of the type shown in figure 1, for a month ormore before breaking under acid to liberate the total emanation. EMANATION METHOD FOR DETERMINATION OF RADIUM. 13 The bulb a, of 4 to 10 mm. diameter, according to the ({uantity ofore to be used, is blo\vii very thin so as to break without endangeringthe outer flask /, contain- fl CAF!N0T/TE I BURETTEf ing HXO3. The ore isweighed into the bulbthrough h and then theglass stem c is sealed onand is constricted to makea complete seal at (Z, theupper end e being alsosealed for whole is introducedthrough a double - boredrubber stopper to a pointjust off the bottom of theflask / and mav be brokenby a slight dowTiward rapon e. By boiling the acid,the ore is readily attackedand all of the emanationis boiled over into a gasburette (see fig. 2). The results obtained with this method check excellently with theresults of the complementary modified Boltwood method as canbe seen from the following table:. Figure 1. -Apparatus for determining emanation by sealed-tube method. Results of sealed bulb method for total emanation in one operation, compared tvith com-plementary method. Numberof ore. Method used. Emanating power,curies XIO. Solutionemanation,curies X103. Total ema-nation pergram of ore,curies X109. /Sealed bulb \Complementary. /Sealed bulb \Complementary. /.Sealed bulb \Complementary. /Sealed bulb \Complementary. /Sealed bulb VComplementary. /Sealed bulb \Complementary. /Sealed bulb [VComplementary. /Sealed bulb \Com piemen tary. eise 8. 60 29. 62 o Sum of results given, on same line, in the two preceding columns. 14 THE RADIUM-URANIUM RATIO IN CARNOTITES. SOLUTION AND BOILING OFF EMANATION. ^^technicalpaper88unit
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