Gaseous Mixtures by Rontgen and Corpuscular Radiations. 849 



Table V. 



Showing relative numbers of ions produced in gases by 

 the complete absorption of Rontgen radiation and all 

 the secondary rays. 



Gas. 



Relative ioniza- 

 tion for equal 

 energy absorp- 

 tions of X-radia- 

 tion. 



Relative energy 

 of X-radiation 

 absorbed for 

 equal numbers 

 of ions produced. 



Air 



100 

 127 



90 

 160 



140 (approx.) 



10 



•79 

 1-11 



•62 

 •72 



SH 



S0 2 



C,H 5 Br 



CHJ 





If we compare these values with the corresponding values 

 of the relative ionizations produced for equal absorptions of 

 corpuscular radiation energy, we see there is a very close 

 similarity, — that is, the relative numbers of ions produced 

 in various gases when a Rontgen radiation is completely 

 absorbed in these gases, are approximately the same as those 

 produced by the complete absorption of a corpuscular 

 radiation. 



Accepting as proved that all X-ray ionization is by means 

 of the ejected corpuscles, the above approximate equality of 

 the relative total ionizations in various gases by X-rays and 

 by corpuscular (electronic) rays, shows that the number of 

 corpuscles set free in a gas by a Rontgen radiation which 

 is completely absorbed depends little if at all upon the 

 nature of the gas. 



Ionization in Gaseous Mixtures by Rontgen Radiation. 



As the number of ions produced by a corpuscular radiation 

 depends to a certain extent upon the gas absorbing that 

 radiation, the total ionization produced by an X-radiation 

 in a mixture of gases should differ from the sum of the 

 ionizations produced in the separate gases, for when a simple 

 gas is ionized it absorbs its own corpuscular radiation, while 

 in a mixture the corpuscles from each gas are partially 

 absorbed by the other gas, and the absorptions of corpuscular 

 radiations by the two gases are by no means proportional to 

 the numbers of corpuscles which they emit. As Barkla and 



