l)ij Air of the Beta Rays from Radium C. 11 



These results are also shown in fig. 2, where the abscissae 

 •e given in metres and the ordinates are the logarithms 



Fi< 



f-2 



30 



26 



f-8 



t'4 



fo 



< 



\ 













> 



\ 













\ 



-*r\ 







(V/ 







o \ 







^ 

 £ 









\j 



i 

















< 



• , 



I 







c 



s 





yrays 





metres / 



of I in divisions for one minute, multiplied by the distance 

 squared in metres. The upper curve represents the ft ray 

 measurements. At one metre the ordinate appears to be too 

 small, possibly because of insufficient voltage to secure 

 saturation, or because of some other effect requiring a 

 special investigation. The average slope for distances most 

 favourable to accurate measurements gives yit = '00M cm. -1 



The lower curve is for <y rays, and a straight line is 

 anticipated. The initial rise is not easy to explain ; the 

 point at 2 metres is too high owing to accidental conditions. 

 In this experiment it is certain that some /3 particles 

 passed through the aluminium screens, and that others were 

 produced by the y rays at emergence from the screens near 

 the radium. 



Therefore, some experiments were made in which the 



