80 



THE PHYSICS OF VIRUSES 



seen later that this is simple for some viruses. It is quite hard for 

 T-1. 



In Fig. 3.5 are shown some unpublished results of Fluke, 

 who subjected T-1 phage to electron bombardment, using 2-Mev 

 electrons from a Van de Graaff accelerator. Again, a semilog- 

 arithmic relation is found when percent survival is plotted 



§ 10 - 



2 4 6 8 



Microcoulombs of Beam 



10 



Fig. 3.5. Electron bombardment of T-1 phage. The survival ratio fits the 

 relation In (n/no) = — VI. Data due to Fluke. 



against primary ionizations per cubic centimeter. This relation 

 corresponds to a bombardment which is random in volume, and 

 so fits the equivalent relation 



In 



n 



no 



- VI 



(3.6) 



where V, the inactivation volume, now takes the place of S, 

 the cross section. I is the number of primary ionizations per 



