镤的同位素
镤的同位素均具有放射性，其中最稳定的为231Pa，质量数在231以下的同位素主要发生α衰变生成锕，而质量数超过231的主要发生β衰变生成铀。
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| 标准原子质量 (Ar, 标准) |
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图表
| 符号 | 历史 名称 |
Z | N | 同位素质量（u） [n 1][n 2] |
半衰期 [n 2] |
衰变 方式[2] |
衰变 产物 [n 3][n 4] |
原子核 自旋[n 1] |
相对丰度 （莫耳分率） |
|---|---|---|---|---|---|---|---|---|---|
| 激发能量[n 2] | |||||||||
| 212Pa | 91 | 121 | 212.02320(8) | 8(5) ms [5.1(+61−19) ms] |
7+# | ||||
| 213Pa | 91 | 122 | 213.02111(8) | 7(3) ms [5.3(+40−16) 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 （不常见） | 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−) | ||
| ε (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 | ε (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 y | α | 227Ac | 3/2− | 1.0000[n 5] |
| 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−) | ||
| ε (.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[n 6] |
| SF (3×10−10%) | (various) | ||||||||
| 234mPa | Uranium X2 Brevium |
78(3) keV | 1.17(3) min | β− (99.83%) | 234U | (0−) | Trace[n 6] | ||
| 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)(−#) | ||
- ^ 1.0 1.1 画上#号的数据代表没有经过实验的证明，仅为理论推测。
- ^ 2.0 2.1 2.2 用括号括起来的数据代表不确定性。
- ^ 稳定的衰变产物以粗体表示。
- ^ 半衰期超过5亿年的衰变产物以粗斜体表示。
- ^ Intermediate decay product of 235U
- ^ 6.0 6.1 Intermediate decay product of 238U
| ← | 同位素列表 | → |
| 钍的同位素 | 镤的同位素 | 铀的同位素 |
参考文献
- ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. Standard atomic weights of the elements 2021 (IUPAC Technical Report). Pure and Applied Chemistry. 2022-05-04. ISSN 1365-3075. doi:10.1515/pac-2019-0603 （英语）.
- ^ Universal Nuclide Chart. nucleonica. [2015-11-03]. （原始内容
存档于2017-02-19）.
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties （页面存档备份，存于互联网档案馆）, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database （页面存档备份，存于互联网档案馆） (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.