108 



Research and National Purpose 



■-I 

 INPUT 



COINCIDENCE f E 

 NPUT 



u 



2 

 NPUT 



REACTOR 



r^ 



•VACUUM PUMP 



SHIELD 



■3h 



DIFFUSED/ 



JUNCTION lO/tG CM^ U'^'''' 



He 



^-<-M^^H-{:^ 



-Al 

 CAN 



INTEGRATING 

 PREAMPLIFIER 



DETECTOR 

 Figure 6. — Coincidence counter registration of fission yields. 



