鏷的同位素均具有放射性，其中最穩定的為231Pa，質量數在231以下的同位素主要發生α衰變生成錒，而質量數超過231的主要發生β衰變生成鈾。
Quick Facts 同位素, 衰變 ...
主要的鏷同位素|
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| 標準原子質量 (Ar, 標準) | - 7002231035880000000♠231.03588(1)[1]
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Close
More information 符號, 歷史 名稱 ...
| 符號
|
歷史
名稱
|
Z
|
N
|
同位素質量（u）
[n 1][n 2]
|
半衰期
[n 2]
|
衰變
方式[2]
|
衰變
產物
[n 3][n 4]
|
原子核
自旋[n 1]
|
相對豐度
（莫耳分率）
|
| 激發能量[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−#
|
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| 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−#
|
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| 217mPa
|
|
1860(7) keV
|
1.08(3) ms
|
α
|
213Ac
|
29/2+#
|
|
| IT （不常見）
|
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−#
|
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| 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
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221Ac
|
5/2−#
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| 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
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| 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−)
|
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| β− (8.4%)
|
230U
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| α (.00319%)
|
226Ac
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| 231Pa
|
Protoactinium
|
91
|
140
|
231.0358840(24)
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3.276(11)×104 y
|
α
|
227Ac
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3/2−
|
1.0000[n 5]
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| CD (1.34×10−9%)
|
207Tl
24Ne
|
| SF (3×10−10%)
|
(various)
|
| CD (10−12%)
|
208Pb
23F
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| 232Pa
|
|
91
|
141
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232.038592(8)
|
1.31(2) d
|
β−
|
232U
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(2−)
|
|
| ε (.003%)
|
232Th
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| 233Pa
|
|
91
|
142
|
233.0402473(23)
|
26.975(13) d
|
β−
|
233U
|
3/2−
|
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| 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)(−#)
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Close
畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
Intermediate decay product of 235U
Intermediate decay product of 238U
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 （英語）.
- 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 （頁面存檔備份，存於網際網路檔案館）, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database （頁面存檔備份，存於網際網路檔案館） (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.
