Isotopes of Protactinium (Z=91)

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Isotope Half-life Spin Parity Decay Mode(s) or Abundance
212Pa 5.1 ms (3+) %A=?
213Pa 5.3 ms %A=?
214Pa 17 ms %A=?
215Pa 14 ms %A=100
216Pa 0.20 s %EC ~ 2 sys %A ~ 98 sys
217Pa 4.9 ms %A =100
217m1Pa 1.6 ms %A < 100
218Pa 0.12 ms %A=100
219Pa 53 ns 9/2- %A=100, %EC+%B+ ~ 5E-9
220Pa 0.78 us %A=100, %EC+%B+=3E-7 sys
221Pa 5.9 us9/2- %A=100
222Pa 2.9 ms %A=100
223Pa 6.5 ms %A=100, %EC+%B+ < 1.0E-3
224Pa 0.79 s %A=100
225Pa 1.7 s %A=100
226Pa 1.8 m %A=74 5, %EC+%B+=26 5
227Pa 38.3 m(5/2-) %A=85 2, %EC=15 2
228Pa 22 h3+ %EC+%B+=98.0 2, %A=2.0 2
229Pa 1.50 d (5/2+) %EC=99.52 5 , %A=0.48 5
230Pa 17.4 d (2-) %EC+%B+=91.6 13, %B-=8.4 13, %A=0.0032 1
231Pa 32760 y 3/2- %A=100, %SF < 1.6E-11
232Pa 1.31 d(2-) %B-=99.997 1, %EC=0.003 1
233Pa 26.967 d 3/2- %B-=100
234Pa 6.70 h4+ %B-=100, %SF < 3E-10
234m1Pa 1.17 m(0-) %B-=99.84 4, %IT=0.16 4, %SF < 1E-9
235Pa 24.5 m(3/2-) %B-=100
236Pa 9.1 m 1(-) %B-=100
237Pa 8.7 m (1/2+) %B-=100
238Pa 2.3 m(3-) %B-=100, %SF < 2.6E-6
239Pa
240Pa
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory
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