y^ -* " ^A^'^' 









^ t, 





- / 



4 vv 



,* > 



Er-T ^^^.'V "l* -V. ^ 



♦ *!- s. 



Bgl* 



m , 





-*,' 4-. 





Fig. 4. Cerebellar cortex, Purkinje cell layer and superficial granular layer, 22 hr 

 after exposure to 40,200 r. Scattered pyknosis of granular cells (PG). NG, normal 

 granular cell: Pu, perikaryon of a Purkinje cell; Bgl, Bergmann glial cell; Bgls, Swell- 

 ing of Bergmann gliocytic processes. X 4.800. 



Fig. 5. Cerebellar cortex, granular layer, 46 hr after exposure to 30,000 r. Nuclei 

 of granular cells show severe shrinkage and clumping of the nucleoplasm (PG). NG, 

 normal granular cell nucleus. X 10,800. 



265 



