50 



POLLARD: No, it is just one, the pulse height analyzed from one. 



BURTON: One could visualize a situation where the track goes down a tube. 

 You have one central electrode and a series of circumferential electrodes with a 

 corresponding number of proportional counters operating simultaneously. The 

 electric circuits may be fixed so that the only time they can operate is when they 

 are all operating. In this way noise effects may be eliminated. The essential 

 idea was used by Libby (20) in some of his work on Carbon 14. He eliminated 

 the noise level by getting only the simultaneous count. This would be an inter- 

 esting technique to be used in the case under discussion. 



TOBIAS: The measurements I mentioned were done on protons. 



BURTON: I might note that the difficulty with the experiment I proposed is 

 that the results would be very important but that the data would be unfortunately 

 numerically unimpressive when measured in terms of man-days required for 

 their production. 



