釤的同位素

釤（原子量：150.36(2)）在自然界中存在5种稳定同位素（144Sm、149Sm、150Sm、152Sm、154Sm）和2种长寿命放射性同位素（半衰期1.06年的147Sm和半衰期7年的148Sm），其中152Sm的丰度最高，达26.74%。146Sm的半衰期也很长，但不足以在今天大量存在，现为。它可用于太阳系的测年。2012年一篇把146Sm的半衰期从10.3(5)年更新到6.8(7)年的论文已于2023年撤稿。它是不确定是不是的核素中半衰期最长的。

除了以上8种同位素以外，钐最长寿的放射性同位素是半衰期94.6年的151Sm以及半衰期340天的145Sm。剩下的同位素原子量介于129至168，半衰期都短于两天。

圖表
|-
| 129Sm
| style="text-align:right" | 62
| style="text-align:right" | 67
| 128.95464(54)#
| 550(100) ms
|
|
| 5/2+#
|
|
|-
| 130Sm
| style="text-align:right" | 62
| style="text-align:right" | 68
| 129.94892(43)#
| 1# s
|
| 130Pm
| 0+
|
|
|-
| rowspan=2|131Sm
| rowspan=2 style="text-align:right" | 62
| rowspan=2 style="text-align:right" | 69
| rowspan=2|130.94611(32)#
| rowspan=2|1.2(2) s
|
| 131Pm
| rowspan=2|5/2+#
| rowspan=2|
| rowspan=2|
|-
| , （不常見）
| 130Nd
|-
| rowspan=2|132Sm
| rowspan=2 style="text-align:right" | 62
| rowspan=2 style="text-align:right" | 70
| rowspan=2|131.94069(32)#
| rowspan=2|4.0(3) s
|
| 132Pm
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| ,
| 131Nd
|-
| rowspan=2|133Sm
| rowspan=2 style="text-align:right" | 62
| rowspan=2 style="text-align:right" | 71
| rowspan=2|132.93867(21)#
| rowspan=2|2.90(17) s
|
| 133Pm
| rowspan=2|(5/2+)
| rowspan=2|
| rowspan=2|
|-
| ,
| 132Nd
|-
| 134Sm
| style="text-align:right" | 62
| style="text-align:right" | 72
| 133.93397(21)#
| 10(1) s
|
| 134Pm
| 0+
|
|
|-
| rowspan=2|135Sm
| rowspan=2 style="text-align:right" | 62
| rowspan=2 style="text-align:right" | 73
| rowspan=2|134.93252(17)
| rowspan=2|10.3(5) s
| (99.98%)
| 135Pm
| rowspan=2|(7/2+)
| rowspan=2|
| rowspan=2|
|-
| , (.02%)
| 134Nd
|-
| style="text-indent:1em" | 135mSm
| colspan="3" style="text-indent:2em" | 0(300)# keV
| 2.4(9) s
|
| 135Pm
| (3/2+,5/2+)
|
|
|-
| 136Sm
| style="text-align:right" | 62
| style="text-align:right" | 74
| 135.928276(13)
| 47(2) s
|
| 136Pm
| 0+
|
|
|-
| style="text-indent:1em" | 136mSm
| colspan="3" style="text-indent:2em" | 2264.7(11) keV
| 15(1) µs
|
|
| (8-)
|
|
|-
| 137Sm
| style="text-align:right" | 62
| style="text-align:right" | 75
| 136.92697(5)
| 45(1) s
|
| 137Pm
| (9/2-)
|
|
|-
| style="text-indent:1em" | 137mSm
| colspan="3" style="text-indent:2em" | 180(50)# keV
| 20# s
|
| 137Pm
| 1/2+#
|
|
|-
| 138Sm
| style="text-align:right" | 62
| style="text-align:right" | 76
| 137.923244(13)
| 3.1(2) min
|
| 138Pm
| 0+
|
|
|-
| 139Sm
| style="text-align:right" | 62
| style="text-align:right" | 77
| 138.922297(12)
| 2.57(10) min
|
| 139Pm
| 1/2+
|
|
|-
| rowspan=2 style="text-indent:1em" | 139mSm
| rowspan=2 colspan="3" style="text-indent:2em" | 457.40(22) keV
| rowspan=2|10.7(6) s
| IT (93.7%)
| 139Sm
| rowspan=2|11/2-
| rowspan=2|
| rowspan=2|
|-
| (6.3%)
| 139Pm
|-
| 140Sm
| style="text-align:right" | 62
| style="text-align:right" | 78
| 139.918995(13)
| 14.82(12) min
|
| 140Pm
| 0+
|
|
|-
| 141Sm
| style="text-align:right" | 62
| style="text-align:right" | 79
| 140.918476(9)
| 10.2(2) min
|
| 141Pm
| 1/2+
|
|
|-
| rowspan=2 style="text-indent:1em" | 141mSm
| rowspan=2 colspan="3" style="text-indent:2em" | 176.0(3) keV
| rowspan=2|22.6(2) min
| (99.69%)
| 141Pm
| rowspan=2|11/2-
| rowspan=2|
| rowspan=2|
|-
| IT (.31%)
| 141Sm
|-
| 142Sm
| style="text-align:right" | 62
| style="text-align:right" | 80
| 141.915198(6)
| 72.49(5) min
|
| 142Pm
| 0+
|
|
|-
| 143Sm
| style="text-align:right" | 62
| style="text-align:right" | 81
| 142.914628(4)
| 8.75(8) min
|
| 143Pm
| 3/2+
|
|
|-
| rowspan=2 style="text-indent:1em" | 143m1Sm
| rowspan=2 colspan="3" style="text-indent:2em" | 753.99(16) keV
| rowspan=2|66(2) s
| IT (99.76%)
| 143Sm
| rowspan=2|11/2-
| rowspan=2|
| rowspan=2|
|-
| (.24%)
| 143Pm
|-
| style="text-indent:1em" | 143m2Sm
| colspan="3" style="text-indent:2em" | 2793.8(13) keV
| 30(3) ms
|
|
| 23/2(-)
|
|
|-
| 144Sm
| style="text-align:right" | 62
| style="text-align:right" | 82
| 143.911999(3)
| colspan=3 align=center|觀測上穩定
| 0+
| 0.0307(7)
|
|-
| style="text-indent:1em" | 144mSm
| colspan="3" style="text-indent:2em" | 2323.60(8) keV
| 880(25) ns
|
|
| 6+
|
|
|-
| 145Sm
| style="text-align:right" | 62
| style="text-align:right" | 83
| 144.913410(3)
| 340(3) d
|
| 145Pm
| 7/2-
|
|
|-
| style="text-indent:1em" | 145mSm
| colspan="3" style="text-indent:2em" | 8786.2(7) keV
| 990(170) ns
[0.96(+19-15) µs]
|
|
| (49/2+)
|
|
|-
| 146Sm
| style="text-align:right" | 62
| style="text-align:right" | 84
| 145.913041(4)
| 9.20(26) a
| style="text-align:right" | 62
| style="text-align:right" | 85
| 146.9148979(26)
| 1.06(2)×1011 a
|
| 143Nd
| 7/2-
| 0.1499(18)
|
|-
| 148Sm
| style="text-align:right" | 62
| style="text-align:right" | 87
| 148.9171847(26)
| colspan=3 align=center|觀測上穩定
| 7/2-
| 0.1382(7)
|
|-
| 150Sm
| style="text-align:right" | 62
| style="text-align:right" | 88
| 149.9172755(26)
| colspan=3 align=center|觀測上穩定
| 0+
| 0.0738(1)
|
|-
| 151Sm
| 0+
| 0.2675(16)
|
|-
| 153Sm
| 0+
| 0.2275(29)
|
|-
| 155Sm
| style="text-align:right" | 62
| style="text-align:right" | 93
| 154.9246402(28)
| 22.3(2) min
|
| 155Eu
| 3/2-
|
|
|-
| 156Sm
| style="text-align:right" | 62
| style="text-align:right" | 94
| 155.925528(10)
| 9.4(2) h
|
| 156Eu
| 0+
|
|
|-
| style="text-indent:1em" | 156mSm
| colspan="3" style="text-indent:2em" | 1397.55(9) keV
| 185(7) ns
|
|
| 5-
|
|
|-
| 157Sm
| style="text-align:right" | 62
| style="text-align:right" | 95
| 156.92836(5)
| 8.03(7) min
|
| 157Eu
| (3/2-)
|
|
|-
| 158Sm
| style="text-align:right" | 62
| style="text-align:right" | 96
| 157.92999(8)
| 5.30(3) min
|
| 158Eu
| 0+
|
|
|-
| 159Sm
| style="text-align:right" | 62
| style="text-align:right" | 97
| 158.93321(11)
| 11.37(15) s
|
| 159Eu
| 5/2-
|
|
|-
| 160Sm
| style="text-align:right" | 62
| style="text-align:right" | 98
| 159.93514(21)#
| 9.6(3) s
|
| 160Eu
| 0+
|
|
|-
| 161Sm
| style="text-align:right" | 62
| style="text-align:right" | 99
| 160.93883(32)#
| 4.8(8) s
|
| 161Eu
| 7/2+#
|
|
|-
| 162Sm
| style="text-align:right" | 62
| style="text-align:right" | 100
| 161.94122(54)#
| 2.4(5) s
|
| 162Eu
| 0+
|
|
|-
| 163Sm
| style="text-align:right" | 62
| style="text-align:right" | 101
| 162.94536(75)#
| 1# s
|
| 163Eu
| 1/2-#
|
|
|-
| 164Sm
| style="text-align:right" | 62
| style="text-align:right" | 102
| 163.94828(86)#
| 500# ms
|
| 164Eu
| 0+
|
|
|-
| 165Sm
| style="text-align:right" | 62
| style="text-align:right" | 103
| 164.95298(97)#
| 200# ms
|
| 165Eu
| 5/2-#
|
|
|}

参考文獻

Isotope masses from [https://web.archive.org/web/20080923134436/http://www.nndc.bnl.gov/amdc/index.html 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 [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)] . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html 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. [http://amdc.in2p3.fr/web/nubase_en.html 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 [http://www.nndc.bnl.gov/nudat2/ 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.

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