Specific Activity 



Number 



lO 



lO 



20 



30 



40 



50 



DAYS AFTER IRRADIATION 



Figure 32. --Comparison between erythrocyte numbers in irradiated pinfish and the specific activity of iron 59 in the 



blood at different times after irradiation. 



and reducing the specific activity. Our present 

 experiments have demonstrated also that the 

 specific activity of the spleen closely follows 

 that of the blood and indicates a close associa- 

 tion between these two compartments. Thus 

 the specific activity of the spleen depends 

 upon the specific activity of the blood. 



The experiments outlined in this part have 

 demonstrated that 2,000 rads of gamma radi- 

 ation caused depression of erythrocyte pro- 

 duction followed by recovery. Before radiation 

 damage and recovery can be fully explained, 

 the iron metabolism in pinfish must be investi- 

 gated further. 



MS. # 184.1 



GPO 866-275 



59 



