64 



MAGEE: In other words, no H^O formation from the radicals seems to 

 be in the picture. 



GARRISON: No, the HOH reaction is either the same or it does not oc- 

 cur in these cases. 



ALLEN: Let's get this straight now. With polonium alphas you have a 

 G of about 1.8 for peroxide and hydrogen and the G for the radical is very 

 small. 



BURTON: If we don't let Dr. Magee present the end of this thing we 

 won't know what we are talking about. He is pretty close to the end. Let's 

 have the entire picture. 



MAGEE: There are two numbers that I have to give. These, of course, 

 assume that radicals formed in the R reaction remain free to be picked up 

 by scavenger. The other radicals are distributed equally in the forward re- 

 action and in the reaction forming H-,0. We fitted our parameter y to agree 

 with gamma rays and then we calculated results for the tritium -3 case using 

 a particular average inter-event distance. The calculated and experimental 

 values are given in table IV. 



TABLE IV 

 CALCULATED AND EXPERIMENTAL VALUES FOR THE RATIO Gf/Gf+G r 



I am essentially through now. What I have tried to give you is the gen- 

 eral picture, and of necessity I have left out a great many details, so that 

 it may not all be clear, but I would appreciate any comments and discus- 

 sion you may have. 



BURTON: Do you have values for alphas, too? 



MAGEE: The alpha case is different. If you have a column you have a 

 distribution described by two variables instead of three. The equation for 

 the fraction of radicals remaining uncombined during expansion is 



N 

 N 



1 



o 



1 + B lnX 



where B is a constant and X is the expansion ratio of the column, i.e. as 

 compared with its initial volume. Thus in an isolated column, all radicals 

 will combine as X approaches infinity. However, there is rapid reaction 

 only at first, and then radical recombination occurs very slowly. 



ALLEN: I should like to make a remark or two. I think on the present 



