685 



TABLE 744.— ANALYSIS OF THE BETA-RAY SPECTRUM OF RADIOACTINIUM 



(THORIUM 227) * 



Energy of /3-ray 



line 4- absorption 



energy 



Mev 



.0125+0192 



.0160+.0154 

 .0262 +.0048 

 .0271 +.0044 

 .0290+.0031 

 .0299 +.00 12 

 .0305 + .0003 

 .0320 



.0246+.0192 

 .0255 + .0185 

 .0281 +.01 54 

 .0388 +.0048 

 .0340 +.01 92 

 .0486 +.0048 

 .0425 +.0192 

 .0567 +.0048 

 .0598+.0012 



For reference, see footnote 233, p. 679. 



TABLE 745.— ANALYSIS OF BETA-RAY SPECTRUM OF MESOTHORIUM 2 



(ACTINIUM 228) * 



For reference, see footnote 233, p. 679. 



TABLE 746.— ANALYSIS OF THE BETA-RAY SPECTRUM OF PROTACTINIUM* 



• For reference, see footnote 233, p. 679. 



SMITHSONIAN PHYSICAL TABLES 



