AUTOR ADIOGKAPIIY 



(a) 



[b) 



Fig. 2. Beta emitters. Photomicrographs of chrome-shadowed particles before (a) and after (b) 

 autoradiography. Beta-emitting particles are covered by spots of dense granules. (Courtesy of N. L. 

 Dockum and R. Borasky, Nucleonics, 15, 110 1957). 



W ■'^ % 





^ 



££^ 



'♦•- 



i 



"* 



(b) 

 Fig. 3. Photomicrographs of superimposed negatives of areas before and after autoradiography. 

 (a) Alpha-emitting particles, (b) Beta-emitting particles. 



12 



