681 



TABLE 738.— ALPHA-RAY SPECTRA OF SOME NATURAL RADIOACTIVE 



MATERIALS (concluded) 



TABLE 739.— CHARACTERISTICS OF SOME HIGH-SPEED ALPHA-PARTICLES 

 FROM NATURAL RADIOACTIVE SOURCES* 



* For reference, see footnote 199. p. 618. 

 t Approximate range in air (from curve). 



SMITHSONIAN PHYSICAL TABLES 



