Sec. 7.12] 



SEABORG AND PERLMAN TABLE OF ISOTOPES 



187 



Isotope 

 Z A 



1 Hi 



H= 



H3 



2 He' 

 He* 

 He« 



Li' 

 Li» 



4 Be 7 



Be' 



Be 3 



Be 10 



5 Bm 

 B" 

 B12 



6 C« 



Class 



Per cent 

 abundance 



99.9344 

 0.0156 



1.3 X 10~« 

 99.9999 



7.39 

 92.61 



Type of 

 radiation 



0~, 2a 



K. 



A 



m.s. 



A 



100 



18.83 

 81.17 



Half-life 



12.1 yr; 

 10.7 yr 



0.89 sec; 

 0.8 sec; 

 0.85 sec 



0.89 sec; 

 0.88 sec 



52.9 days; 

 43 days 



10-" - 



10" 17 sec 

 calc. 



2.5 X 10« 



2.9 X 10" 



yr yield 



0.027 sec; 

 0.022 sec 



20 sec 



Energy of radiation, Mev 



Particles 



0.0185 

 ion.ch.; 

 0.0169 

 ion.ch.; 

 0.015 abs., 

 cl.ch.; 

 0.011 abs., 

 cl.ch. 



3.7 cl.ch.; 

 3.7 abs. Al; 

 3.5 abs. Al 



12(/3") cl. 

 ch.; 12QS-) 

 abs. Al; 

 distribu- 

 tion, mean 

 at 2.0(a) 



0.055 (each 

 a in cen- 

 ter of mass 

 system) 

 ion.ch. 



0.560 abs. 

 Al; 0.58 

 abs. Al; 

 0.65 abs. 

 Al 



12 cl.ch. 



2 abs. 



7- rays 



No y 



No 



No y 



0.485 

 spect. 

 0.485 

 coincid. 

 abs.; 0.476 

 abs. Pb; 

 0.453 

 spect.; 

 0.474 

 spect. 



No 



Produced 

 by 



D-n-7 

 D-d-p 



Ke 3 -n-p 



Li-n-l 



Be-d-t 



B-n-t 



N-n-< 



Li-y-p 

 Li-n-p 

 Be-n-a 



Li-d-p 



Li-n-7 



Li 7 -n-7 



Be-y-p 



B-n-a 



hi-d-n 

 Li-p-n 

 B-p-a 

 B-d-an 



Be-7-n 



Be-d-p 

 Be-n-7 

 B-n-p 

 C-n-a 



B-d-P 

 N ">-n-a 



B-p-n 

 B ">-/>- h 



