Sec. 7.12] 



SEABORG AND PERLMAN TABLE OF ISOTOPES 



247 



Isotope 

 Z A 



82 RaD^io 



AcB2u 



ThB2'2 



RaB2i< 



83 Bii" 



Bil98 



Bii" 



Bi200 



Bi204 



Bi208 



Bi 208 



Bi209 



RaE-'io 



Class 



A 



E 

 D 



B 



B 



B 



F 



A 



Per cent 

 abundance 



100 



Type of 

 radiation 



P . 7 



P , 7 



Half-life 



36.1 min 



10.6 hr 



26.8 min 



Energy of radiation, Mev 



Particles 



spect. 



0.5, 1.40 



abs. Al 



0.36 spect. 



7-rays 



conv. ; 

 several 

 weak lines 

 of lower 

 energy 

 0.8 abs. 



0.65 spect. 



2 min 

 9 min 



27 min 



62 min; 

 ~ 100 min 



12 hr 



6.4 days 



Short 



5.0 days 



6.2 ion.ch. 

 5.83 ion.ch.; 



— 5.5(a) 

 ion.ch. 



5.47 ion.ch., 

 abs. mica; 

 ~ 5.5(a) 

 ion.ch. 



5.15 ion.ch.; 



— 5.5(a) 

 ion.ch. 



0.2(e-), 

 ~0.8(e-, 

 weak) 

 spect., 

 abs. Al 



1.1703") 

 spect.; 

 4.77(a) 

 calc. 



0.74 abs. of 

 e~; 0.93 

 abs. of e~; 

 1.1 abs. 

 Pb; —0.4, 

 1.1 abs. Pb 



X.j 



Produced 

 by 



/3 -decay, 

 RaC':" 

 a-decay, 

 parent of 

 RaE2io 

 Natural 

 source, 

 AcA='5 



a-decay, 

 parent of 

 AcC2n 

 Natural 

 source, 

 ThA2ia 

 a-decay, 

 parent of 

 ThC2i2 



Natural 

 source, 

 RaA2is 



a-decay, 

 parent of 

 RaC2i< 



Pb-d-? 

 Pb-i-? 



Pb-d-? 



Pb-d-? 



Pb Wi -d-2n 

 Tl-a-3n, 

 parent of 



P D 204m 



(~4%) 



Tl-a-3n 

 Pb-d-2n 

 Pb 2 ° 7 -d-3n 



p o 206 



A."-decay 



Bi-n-2n 



Natural 

 source, 

 RaD 2 >° 

 /3"-decay, 

 parent of 

 Po 210 and 

 Tr-os 



