118 Prof. E. Rutherford on Uranium Radiation and 

 Thickness of Aluminium foil *0005 cm. 



Number of 



Layers of 



Aluminium foil. 



Proportionate Rate of Leak. 



Uranium 

 metal. 



Uranium 



Nitrate. 



Uranium 

 Oxide. 



Uranium 



Potassium 

 Sulphate. 





 1 



2 

 3 

 4 

 5 

 12 



1 

 •51 

 •35 



•15 



1 

 •43 



•28 

 •17 

 •15 



•125 



1 



•42 

 •18 

 •08 

 •05 



•04 



1 



•42 

 •27 

 •17 

 •12 



•11 



Fig. 2. 











































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5 



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UffANh 



;m r'orfi 



ss/cw Si 



1 0X/D£ 



UPHAT£ 





















10 E0 30 40 



Thickness of Aluminium : each division -00012 cm. 



