138 



100 



2000 



RADIATION UIOLOGY 



4000 6000 



WAVE LENGTH, A 



(C) 



8000 



Fig. 4-4. Spectral response characteristics for three types of photosurface: (a) type 

 1P22, S-8 response; (6) types 931-A and 1P21, S-4 response; (c) type 1P28, S-5 

 response. (Engsirom, 1947a; Journal Optical Society of America.) 



250 



150 

 AI\JO0E, volts 



Fig. 4-5. Current-voltage characteristic of RCA 935 (ultraviolet sensitive) 

 (Radio Corporation of America.) 



photocell. 



