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BELL SYSTEM TECHNICAL JOURNAL 





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o 



Fig. 2 — Induced radioactivity.resulting from bombardment of carbon by 0.9-MEV 

 protons: tracks of positive electrons. (C. D. Anderson.) 



25 r 



0.8 1.0 



MEV 



Fig. 3 — Distribution-in-energy of positive electrons of the induced radioactivity 

 resulting from bombardment of carbon by 0.9-MEV protons. (Anderson & Nedder- 

 meyer, Physical Review.) 



