3 10 



RADIATION BIOLOGY 



Tahi.k '.1-1 



* When the inactivation dose was not given in roentgens by the authors, it was calculated on the 

 assumijtion that 1 r corresponded to 1.7 X 10'- ion pairs per cubic centimeter for 7 and X rays and to 

 1.9 X 10'2 for a rays and deuterons. 



t References: (1) Bonet-Maury, 1948. (2) Lea, 1946. (3) Lea and Salaman, 1942. (4) Lea and 

 Salaman, 1946. (5) Luria and Exncr, 1941. (6) Pollard and Forro, 1949. (7) Syverton, Berry, and 

 Warren, 1941. (8) Watson, 1950. (9) Wollman et al., 1940. 



J The values are either taken from Lea (1946) or read from Fig. 8 in Lea (1946). Since Lea assumed a 

 value of 1.35 for the density of viruses, this value was adopted throughout, although for viruses irradi- 

 ated in liquid a value of 1.13 would be a more likely estimate In no case would such a difference affect 

 the calculated diameters, which at any rate arc simply rough estimates, by more than 10 per cent. 



§ The particle sizes ol)tained by filtration or centrifugation correspond to "wet" sizes; those by elec- 

 tron microscopy are "drj-" sizes. 



