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Decay Curves of Uranium X. 



A. Uranium X separated by ferric method after 19 hours accumulation. 



B. Uranium X separated by barium sulphate after 23 hours accumulation. 

 A I., BL, preparation bare. 



All., BIL, preparation covered with celluloid screen. 



A III., preparation covered with aluminium screen. 



A IV., BIV. Difference curves by subtracting the extrapolated curve from A I. and BI. 



