EMISSION AND TRANSMISSION OF RONTGEtf RAYS. 



143 



2'0, 



; 



1-5 



O25 -05O 

 MASS PER UNIT AREA Of SCf! H 



075 







Fig. 11. Copim'. 1 r,-i(li;ilor, 20,000 volts. 



Thus the slope of the tangent at any point on the curves gives (when multiplied by 

 2'3) \/p for that region, where p is the density of the screen. The curves in each 

 figure indicate the comparative effects of the three screens on the one radiation, and 



15 



-i ,!, i; : : 



1 





CIS 'OSO 

 MASS Pf) UAIITAflfA Or C CR H 



Fig. 12. Ft radiator, 20,000 volts. 



