RADIATION INJURY AND LETHALITY 



455 



10 



1 - 



10' 



--10 



■5 10 



E 



10 



10 



10" 



0.1 



1 



10 100 



Time, days 



1000 



10,000 



Fig. 9. Cumulant lethality functions for six species of mammals, plotted against 

 time on a log-log grid. All x-ray-treated groups were given short exposures 5, 6, or 

 7 days per week. The gamma-ray series was exposed for 8 or 24 hr per day 7 days per 

 week. The Cl for all gamma-r-ay groups was increased by a factor of 2 to compensate 

 for differences in radiation quality and protraction. Neutrons equated to x-rays, 

 using equivalent biological eiTectiveness for acute effects (45). Curves fitted visually. 

 A, Rabbit, x-ray (43-45); B, rat, x-ray (35, 43, 49); C, mouse, x- and 7-ray (33, 

 46-49); D, mouse, neutron (46); E, dog, x-ray (36, 43, 50); F, guinea pig, x- and 7-ray 

 (44, 48, 49); G, monkey, x-ray (43); H, common asymptote to all high dose-rate 



points. 



