RADIATION IN PRENATAL DEVELOPMENT 



IOO-» •- 



905 



400 



O O 5% 2 + 95 % He ; 



AIR 



Fig. 13-9. Quantitative comparison between the effects of prenatal irradiation of the 



mouse in an atmosphere of 5% 2 + 95% He (O O) and in air (• •). All 



treatments (0, 100, 200, 300, and 400 r) were administered on day 11^ postconception 

 and all observations made at birth. (Russell, Russell, and Major, 1951.) a = mean 

 birth weight; b = mortality; c = tail length; d = tail shape; e = forefeet; / = hind 

 feet. 



