154 



BIOLOGICAL EFFECTS OF RADIATION 



600 



fxw./cTa.'^ 



— 400 



— 300 



— 200 



— 100 



.^^a 



u 



Aam 



L.^ 



u 



I u 



U-A 



22 24 26 28 30 35 40 50 7( 



' . . |...r|iinliiiililij|iiiilniiliiuliMilMMlilnlMillMliliMilinliniliiiilimlimUiJ I I I I I III I I 1 1 1 1 1 llilil I.I.I Illllllllll I 



I I ' I I M r I I I I I I II I II 



-4 ^ 7 2 



70 



SHARP TRIPLETS 4^ Ij^ U \ ^ _l \ if. 



i 



1 ^. J 'P° . ' . - :S 



' T:iLllI^l^3:::j~tl^— J 



'Po.i.g-n'Dm 



DIFFUSE TRIPLETS 



H 



I 'P'-n'D. 



DIFFUSE SINGLETS 



'Pi-n'So 



SHARP SINGLETS 



COMBINATIONS 



uf 



1=1 

 DO 



I 



oatf 



• — lO 



- (VJ_ 



Fig. 8. — Intensity distribution from high-intensity mercury arc. Ordinatea give 

 /iw./cm.2 irradiation at 25 cm. from a 20-mm. exposed midsection of a 250-volt arc, operated 

 on 143.5 volts and 4.5 amp. Abscissas give wave-lengths on prismatic scale, increasing 

 to the right, with photographic spectrum below. Spectral identification shown diagram- 

 matically. {From MeAliater, 50.) 



