鈰的同位素

鈰（原子量：140.116(1)）的同位素，其中有1個同位素是穩定的，另外有3個目前歸類為穩定的同位素，理論上都會進行雙β衰變（衰變為鋇或釹），但是半衰期都只有下界。

 圖表 

|-
| 119Ce
| style="text-align:right" | 58
| style="text-align:right" | 61
| 118.95276(64)#
| 200# ms
| 
| 119La
| 5/2+#
|
|
|-
| 120Ce
| style="text-align:right" | 58
| style="text-align:right" | 62
| 119.94664(75)#
| 250# ms
| 
| 120La
| 0+
|
|
|-
| 121Ce
| style="text-align:right" | 58
| style="text-align:right" | 63
| 120.94342(54)#
| 1.1(1) s
| 
| 121La
| (5/2)(+#)
|
|
|-
| rowspan=2|122Ce
| rowspan=2 style="text-align:right" | 58
| rowspan=2 style="text-align:right" | 64
| rowspan=2|121.93791(43)#
| rowspan=2|2# s
| 
| 122La
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| , 
| 121Ba
|-
| rowspan=2|123Ce
| rowspan=2 style="text-align:right" | 58
| rowspan=2 style="text-align:right" | 65
| rowspan=2|122.93540(32)#
| rowspan=2|3.8(2) s
| 
| 123La
| rowspan=2|(5/2)(+#)
| rowspan=2|
| rowspan=2|
|-
| , 
| 122Ba
|-
| 124Ce
| style="text-align:right" | 58
| style="text-align:right" | 66
| 123.93041(32)#
| 9.1(12) s
| 
| 124La
| 0+
|
|
|-
| rowspan=2|125Ce
| rowspan=2 style="text-align:right" | 58
| rowspan=2 style="text-align:right" | 67
| rowspan=2|124.92844(21)#
| rowspan=2|9.3(3) s
| 
| 125La
| rowspan=2|(7/2-)
| rowspan=2|
| rowspan=2|
|-
| , 
| 124Ba
|-
| 126Ce
| style="text-align:right" | 58
| style="text-align:right" | 68
| 125.92397(3)
| 51.0(3) s
| 
| 126La
| 0+
|
|
|-
| 127Ce
| style="text-align:right" | 58
| style="text-align:right" | 69
| 126.92273(6)
| 29(2) s
| 
| 127La
| 5/2+#
|
|
|-
| 128Ce
| style="text-align:right" | 58
| style="text-align:right" | 70
| 127.91891(3)
| 3.93(2) min
| 
| 128La
| 0+
|
|
|-
| 129Ce
| style="text-align:right" | 58
| style="text-align:right" | 71
| 128.91810(3)
| 3.5(3) min
| 
| 129La
| (5/2+)
|
|
|-
| 130Ce
| style="text-align:right" | 58
| style="text-align:right" | 72
| 129.91474(3)
| 22.9(5) min
| 
| 130La
| 0+
|
|
|-
| style="text-indent:1em" | 130mCe
| colspan="3" style="text-indent:2em" | 2453.6(3) keV
| 100(8) ns
|
|
| (7-)
|
|
|-
| 131Ce
| style="text-align:right" | 58
| style="text-align:right" | 73
| 130.91442(4)
| 10.2(3) min
| 
| 131La
| (7/2+)
|
|
|-
| style="text-indent:1em" | 131mCe
| colspan="3" style="text-indent:2em" | 61.8(1) keV
| 5.0(10) min
| 
| 131La
| (1/2+)
|
|
|-
| 132Ce
| style="text-align:right" | 58
| style="text-align:right" | 74
| 131.911460(22)
| 3.51(11) h
| 
| 132La
| 0+
|
|
|-
| style="text-indent:1em" | 132mCe
| colspan="3" style="text-indent:2em" | 2340.8(5) keV
| 9.4(3) ms
| IT
| 132Ce
| (8-)
|
|
|-
| 133Ce
| style="text-align:right" | 58
| style="text-align:right" | 75
| 132.911515(18)
| 97(4) min
| 
| 133La
| 1/2+
|
|
|-
| style="text-indent:1em" | 133mCe
| colspan="3" style="text-indent:2em" | 37.1(8) keV
| 4.9(4) h
| 
| 133La
| 9/2-
|
|
|-
| 134Ce
| style="text-align:right" | 58
| style="text-align:right" | 76
| 133.908925(22)
| 3.16(4) d
| 
| 134La
| 0+
|
|
|-
| 135Ce
| style="text-align:right" | 58
| style="text-align:right" | 77
| 134.909151(12)
| 17.7(3) h
| 
| 135La
| 1/2(+)
|
|
|-
| style="text-indent:1em" | 135mCe
| colspan="3" style="text-indent:2em" | 445.8(2) keV
| 20(1) s
| IT
| 135Ce
| (11/2-)
|
|
|-
| 136Ce
| style="text-align:right" | 58
| style="text-align:right" | 78
| 135.907172(14)
| colspan=3 align=center|觀測上穩定理论上会通过衰变成136Ba，半衰期超过38×1015年
| 0+
| 0.00185(2)
| 0.00185-0.00186
|-
| style="text-indent:1em" | 136mCe
| colspan="3" style="text-indent:2em" | 3095.5(4) keV
| 2.2(2) µs
|
|
| 10+
|
|
|-
| 137Ce
| style="text-align:right" | 58
| style="text-align:right" | 79
| 136.907806(14)
| 9.0(3) h
| 
| 137La
| 3/2+
| 
| 
|-
| rowspan=2 style="text-indent:1em" | 137mCe
| rowspan=2 colspan="3" style="text-indent:2em" | 254.29(5) keV
| rowspan=2|34.4(3) h
| IT (99.22%)
| 137Ce
| rowspan=2|11/2-
| rowspan=2|
| rowspan=2|
|-
|  (.779%)
| 137La
|-
| 138Ce
| style="text-align:right" | 58
| style="text-align:right" | 80
| 137.905991(11)
| colspan=3 align=center|觀測上穩定理论上会通过衰变成138Ba，半衰期超过150×1012年
| 0+
| 0.00251(2)
| 0.00251-0.00254
|-
| style="text-indent:1em" | 138mCe
| colspan="3" style="text-indent:2em" | 2129.17(12) keV
| 8.65(20) ms
| IT
| 138Ce
| 7-
|
|
|-
| 139Ce
| style="text-align:right" | 58
| style="text-align:right" | 81
| 138.906653(8)
| 137.641(20) d
| 
| 139La
| 3/2+
|
|
|-
| style="text-indent:1em" | 139mCe
| colspan="3" style="text-indent:2em" | 754.24(8) keV
| 56.54(13) s
| IT
| 139Ce
| 11/2-
|
|
|-
| 140Ce裂变产物
| style="text-align:right" | 58
| style="text-align:right" | 82
| 139.9054387(26)
| colspan=3 align=center|
| 0+
| 0.88450(51)
| 0.88446-0.88449
|-
| style="text-indent:1em" | 140mCe
| colspan="3" style="text-indent:2em" | 2107.85(3) keV
| 7.3(15) µs
|
|
| 6+
|
|
|-
| 141Ce
| style="text-align:right" | 58
| style="text-align:right" | 83
| 140.9082763(26)
| 32.508(13) d
| 
| 141Pr
| 7/2-
|
|
|-
| 142Ce
| style="text-align:right" | 58
| style="text-align:right" | 84
| 141.909244(3)
| colspan=3 align=center|觀測上穩定理论上会通过衰变成142Nd，半衰期超过50×1015年
| 0+
| 0.11114(51)
| 0.11114-0.11114
|-
| 143Ce
| style="text-align:right" | 58
| style="text-align:right" | 85
| 142.912386(3)
| 33.039(6) h
| 
| 143Pr
| 3/2-
|
|
|-
| 144Ce
| style="text-align:right" | 58
| style="text-align:right" | 86
| 143.913647(4)
| 284.91(5) d
| 
| 144mPr
| 0+
|
|
|-
| 145Ce
| style="text-align:right" | 58
| style="text-align:right" | 87
| 144.91723(4)
| 3.01(6) min
| 
| 145Pr
| (3/2-)
|
|
|-
| 146Ce
| style="text-align:right" | 58
| style="text-align:right" | 88
| 145.91876(7)
| 13.52(13) min
| 
| 146Pr
| 0+
|
|
|-
| 147Ce
| style="text-align:right" | 58
| style="text-align:right" | 89
| 146.92267(3)
| 56.4(10) s
| 
| 147Pr
| (5/2-)
|
|
|-
| 148Ce
| style="text-align:right" | 58
| style="text-align:right" | 90
| 147.92443(3)
| 56(1) s
| 
| 148Pr
| 0+
|
|
|-
| 149Ce
| style="text-align:right" | 58
| style="text-align:right" | 91
| 148.9284(1)
| 5.3(2) s
| 
| 149Pr
| (3/2-)#
|
|
|-
| 150Ce
| style="text-align:right" | 58
| style="text-align:right" | 92
| 149.93041(5)
| 4.0(6) s
| 
| 150Pr
| 0+
|
|
|-
| 151Ce
| style="text-align:right" | 58
| style="text-align:right" | 93
| 150.93398(11)
| 1.02(6) s
| 
| 151Pr
| 3/2-#
|
|
|-
| 152Ce
| style="text-align:right" | 58
| style="text-align:right" | 94
| 151.93654(21)#
| 1.4(2) s
| 
| 152Pr
| 0+
|
|
|-
| 153Ce
| style="text-align:right" | 58
| style="text-align:right" | 95
| 152.94058(43)#
| 500# ms [>300 ns]
| 
| 153Pr
| 3/2-#
|
|
|-
| 154Ce
| style="text-align:right" | 58
| style="text-align:right" | 96
| 153.94342(54)#
| 300# ms [>300 ns]
| 
| 154Pr
| 0+
|
|
|-
| 155Ce
| style="text-align:right" | 58
| style="text-align:right" | 97
| 154.94804(64)#
| 200# ms [>300 ns]
| 
| 155Pr
| 5/2-#
|
|
|-
| 156Ce
| style="text-align:right" | 58
| style="text-align:right" | 98
| 155.95126(64)#
| 150# ms
| 
| 156Pr
| 0+
|
|
|-
| 157Ce
| style="text-align:right" | 58
| style="text-align:right" | 99
| 156.95634(75)#
| 50# ms
| 
| 157Pr
| 7/2+#
|
|
|}

 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).
 Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report) . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005) .
 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.

Ce
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