錼的同位素

錼只痕量存在于自然界，通常由人工合成制得，因此无法确定。镎有从219Np至244Np（不包括221Np）共25种同位素，没有一个是稳定的。最长寿的放射性同位素是237Np，半衰期214.4万年。

圖表

|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 132
| 225.03391(8)
| 3# ms [>2 µs]
| 
| 221Pa
| 9/2−#
|
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 133
| 226.03515(10)#
| 35(10) ms
| 
| 222Pa
|
|
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 134
| rowspan=2|227.03496(8)
| rowspan=2|510(60) ms
|  (99.95%)
| 223Pa
| rowspan=2|5/2−#
| rowspan="2" |
|-
|  (.05%)
| 227U
|-
| rowspan=3|
| rowspan=3 style="text-align:right" | 93
| rowspan=3 style="text-align:right" | 135
| rowspan=3|228.03618(21)#
| rowspan=3|61.4(14) s
|  (59%)
| 228U
| rowspan=3|
| rowspan="3" |
|-
|  (41%)
| 224Pa
|-
| , SF (.012%)
| (various)
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 136
| rowspan=2|229.03626(9)
| rowspan=2|4.0(2) min
|  (51%)
| 225Pa
| rowspan=2|5/2+#
| rowspan="2" |
|-
|  (49%)
| 229U
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 137
| rowspan=2|230.03783(6)
| rowspan=2|4.6(3) min
|  (97%)
| 230U
| rowspan=2|
| rowspan="2" |
|-
|  (3%)
| 226Pa
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 138
| rowspan=2|231.03825(5)
| rowspan=2|48.8(2) min
|  (98%)
| 231U
| rowspan=2|(5/2)(+#)
| rowspan="2" |
|-
|  (2%)
| 227Pa
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 139
| rowspan=2|232.04011(11)#
| rowspan=2|14.7(3) min
|  (99.99%)
| 232U
| rowspan=2|(4+)
| rowspan="2" |
|-
|  (.003%)
| 228Pa
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 140
| rowspan=2|233.04074(5)
| rowspan=2|36.2(1) min
|  (99.99%)
| 233U
| rowspan=2|(5/2+)
| rowspan="2" |
|-
|  (.001%)
| 229Pa
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 141
| 234.042895(9)
| 4.4(1) d
| 
| 234U
| (0+)
|
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 142
| rowspan=2|235.0440633(21)
| rowspan=2|396.1(12) d
| 
| 235U
| rowspan=2|5/2+
| rowspan="2" |
|-
|  (.0026%)
| 231Pa
|-
| rowspan=3|Fissile nuclide
| rowspan=3 style="text-align:right" | 93
| rowspan=3 style="text-align:right" | 143
| rowspan=3|236.04657(5)
| rowspan=3|1.54(6)×105 y
|  (87.3%)
| 236U
| rowspan=3|(6−)
| rowspan="3" |
|-
|  (12.5%)
| 236Pu
|-
|  (.16%)
| 232Pa
|-
| rowspan=2 style="text-indent:1em" | 
| rowspan=2 colspan="3" style="text-indent:2em" | 60(50) keV
| rowspan=2|22.5(4) h
|  (52%)
| 236U
| rowspan=2|1
| rowspan="2" |
|-
|  (48%)
| 236Pu
|-
| rowspan=3|最常见同位素
| rowspan=3 style="text-align:right" | 93
| rowspan=3 style="text-align:right" | 144
| rowspan=3|237.0481734(20)
| rowspan=3|2.144(7)×106 y
| 
| 233Pa
| rowspan=3|5/2+
| rowspan="3" |痕量由铀的中子捕获产生
|-
|  (2×10−10%)
| (various)
|-
|  (4×10−12%)
| 207Tl30Mg
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 145
| 238.0509464(20)
| 2.117(2) d
| 
| 238Pu
| 2+
|
|-
| style="text-indent:1em" | 
| colspan="3" style="text-indent:2em" | 2300(200)# keV
| 112(39) ns
|
|
|
|
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 146
| 239.0529390(22)
| 2.356(3) d
| 
| 239Pu
| 5/2+
|痕量
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 147
| 240.056162(16)
| 61.9(2) min
| 
| 240Pu
| (5+)
|痕量244Pu的衰变产物
|-
| rowspan=2 style="text-indent:1em" | 
| rowspan=2 colspan="3" style="text-indent:2em" | 20(15) keV
| rowspan=2|7.22(2) min
|  (99.89%)
| 240Pu
| rowspan=2|1(+)
| rowspan="2" |
|-
| IT (.11%)
| 240Np
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 148
| 241.05825(8)
| 13.9(2) min
| 
| 241Pu
| (5/2+)
|
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 149
| 242.06164(21)
| 2.2(2) min
| 
| 242Pu
| (1+)
|
|-
| style="text-indent:1em" | 
| colspan="3" style="text-indent:2em" | 0(50)# keV
| 5.5(1) min
|
|
| 6+#
|
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 150
| 243.06428(3)#
| 1.85(15) min
| 
| 243Pu
| (5/2−)
|
|-
| 
| style="text-align:right" | 93
| style="text-align:right" | 151
| 244.06785(32)#
| 2.29(16) min
| 
| 244Pu
| (7−)
|
|}

 参考文獻 

 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 , Nuc. Phys. A 729, pp. 3-128 (2003).
 National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database  (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.

Np
Category:錼的同位素