Relation between Uranium and Radium. 



Preparation No. III. 



408 grms. Uranium. Purified December 13, 1906. 



215 



1 





1 



Constant 





Date. 



Time from 



i Leak (divs. 



(grms. EaXlO -12 



Radium 



start (years). 



per minute). 



required to give 



(grms. X 10~~ 12 > 





1 





1 div. per min.). 





Aug. 8, 1908 



166 



0-67. 





4 



Nov. 11, 1908 ... 



1-93 



0-77 





4 



May 6, 1909 



239 



1-25 y 



5-78 



7 



June 15, 1909 ... 



2-50 



1-26 





7 



Oct. 1, 1909 



2-80 



1-37 J 





8 



March 4, 1910 .. 



322 



1-78 1 

 1-6 i 



52 



9 



June 10, 1910 ... 



349 



8 



Aug. 20, 1911 ... 



468 



35 



525 



18 



March 8, 1912 ... 



523 



244 



53 



13 



July 28, 1914 ... 



763 



4-08 



535 



22 



Oct. 24, 1914 ... 



7-86 



1-50] 





22 



Nov. 30, 1914 ... 



796 



1-51 I 



14-46 



22 



March 1(3, 1915... 



826 



158 J 





23 



May 3, 1915 



839 



1-41 



1566 



22 



Preparation No. IV. 

 3000 grms. Uranium. Purified Juno 4, 1909. 









Constant 





Date 



Time from 



Leak (divs. 



(grms. RaXlO -12 



Radium 





start (years). 



per minute). 



required to give 

 1 div. per min.). 



(grina-XlO -12 . 



Ang. 26, 1909 ... 



022 



70 1 





40 



Sept. 28, 1909 ... 



031 



7-1 L 



5-78 



41 



Dec. 9, 1909 



051 



79 J 





46 



March 3, 1910 ... 



0-74 



8-2 | 

 6-3 f 





i:; 



June 12,1910 ... 



1-02 



,vJ 



43 



Aug. 24, 1911 ... 



2-21 



106 



5-25 



56 



Feb. 2, 1912 



266 



10 11 



5 3 



56 



July 31, 1914 ... 



515 



194 



535 



104 



Dec. 2, 1914 



5 49 



7-21 

 81 j 



14-46 



104 



March 17, 1915... 



5-78 



117 



May 4, 1915 



591 



74 



15-66 



110 



These results are plotted in fig. 1, with time in year- as 

 abscissa) and quantities of radium (xl0~ l2 g.)as ordinates. 

 In the case of Preparation II., 20 must be subtracted from 

 the ordinates in the figure. 



