HEMATOLOGIC EFFECTS OF RADIATION 



1071 



^* «WT\ ' 





Fig. 16-21. Femoral marrow of mice 8 days after exposure to 1025 r of total-body X 

 irradiation. (.4) Control untreated. (B) Control operated only. (C) Total-body 

 X irradiation without spleen protection. (D) Total-body X irradiation with spleen 

 lead-shielded during irradiation. 



Spleen or appendix shielding in the rabbit during exposure to 800 or 

 1000 r appears not to affect survival appreciably even though regenera- 

 tion of blood-forming tissue precedes the recovery of this tissue in the 

 animals without spleen or appendix shielding (Jacobson, Simmons, 

 Marks, Gaston, et al., 1951). 



