186 



BIOLOGICAL EFFECTS OF RADIATION 



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Fig. 27. — Intensity distribution from a low-intensity mercury arc. Ordinates give 

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

 ated on 44 volts and 3.0 amp. {From data of McAlister, 50.) Abscissas wave-lengths on 

 prismatic scale, A/100. Spectral designation indicated below. 



