Isotopes of Protactinium (Z=91)
Isotope
 Halflife
 Spin
Parity
 Decay Mode(s) or
Abundance 
^{ 212}Pa
 5.1 ms  (3+) 
%A=?

^{ 213}Pa
 5.3 ms  
%A=?

^{ 214}Pa
 17 ms  
%A=?

^{ 215}Pa
 14 ms  
%A=100

^{ 216}Pa
 0.20 s  
%EC ~ 2 sys %A ~ 98 sys

^{ 217}Pa
 4.9 ms  
%A =100

^{217m1}Pa
 1.6 ms  
%A < 100

^{ 218}Pa
 0.12 ms  
%A=100

^{ 219}Pa
 53 ns  9/2 
%A=100, %EC+%B+ ~ 5E9

^{ 220}Pa
 0.78 us  
%A=100, %EC+%B+=3E7 sys

^{ 221}Pa
 5.9 us  9/2 
%A=100

^{ 222}Pa
 2.9 ms  
%A=100

^{ 223}Pa
 6.5 ms  
%A=100, %EC+%B+ < 1.0E3

^{ 224}Pa
 0.79 s  
%A=100

^{ 225}Pa
 1.7 s  
%A=100

^{ 226}Pa
 1.8 m  
%A=74 5, %EC+%B+=26 5

^{ 227}Pa
 38.3 m  (5/2) 
%A=85 2, %EC=15 2

^{ 228}Pa
 22 h  3+ 
%EC+%B+=98.0 2, %A=2.0 2

^{ 229}Pa
 1.50 d  (5/2+) 
%EC=99.52 5 , %A=0.48 5

^{ 230}Pa
 17.4 d  (2) 
%EC+%B+=91.6 13, %B=8.4 13, %A=0.0032 1

^{ 231}Pa
 32760 y  3/2 
%A=100, %SF < 1.6E11

^{ 232}Pa
 1.31 d  (2) 
%B=99.997 1, %EC=0.003 1

^{ 233}Pa
 26.967 d  3/2 
%B=100

^{ 234}Pa
 6.70 h  4+ 
%B=100, %SF < 3E10

^{234m1}Pa
 1.17 m  (0) 
%B=99.84 4, %IT=0.16 4, %SF < 1E9

^{ 235}Pa
 24.5 m  (3/2) 
%B=100

^{ 236}Pa
 9.1 m  1() 
%B=100

^{ 237}Pa
 8.7 m  (1/2+) 
%B=100

^{ 238}Pa
 2.3 m  (3) 
%B=100, %SF < 2.6E6

^{ 239}Pa
  

^{ 240}Pa
  

Last update on
February 5, 2024