Table
| nuclide symbol |
historic name |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s) |
daughter isotope(s) |
nuclear spin |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
|---|---|---|---|---|---|---|---|---|---|---|
| excitation energy | ||||||||||
| 212Pa | 91 | 121 | 212.02320(8) | 8(5) ms |
7+# | |||||
| 213Pa | 91 | 122 | 213.02111(8) | 7(3) ms |
α | 209Ac | 9/2-# | |||
| 214Pa | 91 | 123 | 214.02092(8) | 17(3) ms | α | 210Ac | ||||
| 215Pa | 91 | 124 | 215.01919(9) | 14(2) ms | α | 211Ac | 9/2-# | |||
| 216Pa | 91 | 125 | 216.01911(8) | 105(12) ms | α (80%) | 212Ac | ||||
| β+ (20%) | 216Th | |||||||||
| 217Pa | 91 | 126 | 217.01832(6) | 3.48(9) ms | α | 213Ac | 9/2-# | |||
| 217mPa | 1860(7) keV | 1.08(3) ms | α | 213Ac | 29/2+# | |||||
| IT (rare) | 217Pa | |||||||||
| 218Pa | 91 | 127 | 218.020042(26) | 0.113(1) ms | α | 214Ac | ||||
| 219Pa | 91 | 128 | 219.01988(6) | 53(10) ns | α | 215Ac | 9/2- | |||
| β+ (5×10−9%) | 219Th | |||||||||
| 220Pa | 91 | 129 | 220.02188(6) | 780(160) ns | α | 216Ac | 1-# | |||
| 221Pa | 91 | 130 | 221.02188(6) | 4.9(8) µs | α | 217Ac | 9/2- | |||
| 222Pa | 91 | 131 | 222.02374(8)# | 3.2(3) ms | α | 218Ac | ||||
| 223Pa | 91 | 132 | 223.02396(8) | 5.1(6) ms | α | 219Ac | ||||
| β+ (.001%) | 223Th | |||||||||
| 224Pa | 91 | 133 | 224.025626(17) | 844(19) ms | α (99.9%) | 220Ac | 5-# | |||
| β+ (.1%) | 224Th | |||||||||
| 225Pa | 91 | 134 | 225.02613(8) | 1.7(2) s | α | 221Ac | 5/2-# | |||
| 226Pa | 91 | 135 | 226.027948(12) | 1.8(2) min | α (74%) | 222Ac | ||||
| β+ (26%) | 226Th | |||||||||
| 227Pa | 91 | 136 | 227.028805(8) | 38.3(3) min | α (85%) | 223Ac | (5/2-) | |||
| EC (15%) | 227Th | |||||||||
| 228Pa | 91 | 137 | 228.031051(5) | 22(1) h | β+ (98.15%) | 228Th | 3+ | |||
| α (1.85%) | 224Ac | |||||||||
| 229Pa | 91 | 138 | 229.0320968(30) | 1.50(5) d | EC (99.52%) | 229Th | (5/2+) | |||
| α (.48%) | 225Ac | |||||||||
| 229mPa | 11.6(3) keV | 420(30) ns | 3/2- | |||||||
| 230Pa | 91 | 139 | 230.034541(4) | 17.4(5) d | β+ (91.6%) | 230Th | (2-) | |||
| β- (8.4%) | 230U | |||||||||
| α (.00319%) | 226Ac | |||||||||
| 231Pa | Protoactinium | 91 | 140 | 231.0358840(24) | 3.276(11)×104 a | α | 227Ac | 3/2- | 1.0000 | |
| CD (1.34×10−9%) | 207Tl 24Ne |
|||||||||
| SF (3×10−10%) | (various) | |||||||||
| CD (10−12%) | 208Pb 23F |
|||||||||
| 232Pa | 91 | 141 | 232.038592(8) | 1.31(2) d | β- | 232U | (2-) | |||
| EC (.003%) | 232Th | |||||||||
| 233Pa | 91 | 142 | 233.0402473(23) | 26.975(13) d | β- | 233U | 3/2- | |||
| 234Pa | Uranium Z | 91 | 143 | 234.043308(5) | 6.70(5) h | β- | 234U | 4+ | Trace | |
| SF (3×10−10%) | (various) | |||||||||
| 234mPa | Uranium X2 Brevium |
78(3) keV | 1.17(3) min | β- (99.83%) | 234U | (0-) | Trace | |||
| IT (.16%) | 234Pa | |||||||||
| SF (10−10%) | (various) | |||||||||
| 235Pa | 91 | 144 | 235.04544(5) | 24.44(11) min | β- | 235U | (3/2-) | |||
| 236Pa | 91 | 145 | 236.04868(21) | 9.1(1) min | β- | 236U | 1(-) | |||
| β-, SF (6×10−8%) | (various) | |||||||||
| 237Pa | 91 | 146 | 237.05115(11) | 8.7(2) min | β- | 237U | (1/2+) | |||
| 238Pa | 91 | 147 | 238.05450(6) | 2.27(9) min | β- | 238U | (3-)# | |||
| β-, SF (2.6×10−6%) | (various) | |||||||||
| 239Pa | 91 | 148 | 239.05726(21)# | 1.8(5) h | β- | 239U | (3/2)(-#) | |||
| 240Pa | 91 | 149 | 240.06098(32)# | 2# min | β- | 240U | ||||
Read more about this topic: Isotopes Of Protactinium
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