钐的同位素

钐（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1.0611年的147Sm和半衰期715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extinct radionuclide。它可用于太阳系的测年。2012年一篇把146Sm的半衰期从10.3(5)7年更新到6.8(7)7年的论文已于2023年撤稿。它是不确定是不是primordial nuclide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。

**图表**
129Sm
62
67
128.95464(54)#
550(100) ms
5/2+#
130Sm
62
68
129.94892(43)#
1# s
β+
130Pm
0+
131Sm
62
69
130.94611(32)#
1.2(2) s
β+
131Pm
5/2+#
β+, p （不常见）
130Nd
132Sm
62
70
131.94069(32)#
4.0(3) s
β+
132Pm
0+
β+, p
131Nd
133Sm
62
71
132.93867(21)#
2.90(17) s
β+
133Pm
(5/2+)
β+, p
132Nd
134Sm
62
72
133.93397(21)#
10(1) s
β+
134Pm
0+
135Sm
62
73
134.93252(17)
10.3(5) s
β+ (99.98%)
135Pm
(7/2+)
β+, p (.02%)
134Nd
135mSm
0(300)# keV
2.4(9) s
β+
135Pm
(3/2+,5/2+)
136Sm
62
74
135.928276(13)
47(2) s
β+
136Pm
0+
136mSm
2264.7(11) keV
15(1) µs
(8-)
137Sm
62
75
136.92697(5)
45(1) s
β+
137Pm
(9/2-)
137mSm
180(50)# keV
20# s
β+
137Pm
1/2+#
138Sm
62
76
137.923244(13)
3.1(2) min
β+
138Pm
0+
139Sm
62
77
138.922297(12)
2.57(10) min
β+
139Pm
1/2+


139mSm
457.40(22) keV
10.7(6) s
IT (93.7%)
139Sm
11/2-
β+ (6.3%)
139Pm
140Sm
62
78
139.918995(13)
14.82(12) min
β+
140Pm
0+
141Sm
62
79
140.918476(9)
10.2(2) min
β+
141Pm
1/2+
141mSm
176.0(3) keV
22.6(2) min
β+ (99.69%)
141Pm
11/2-
IT (.31%)
141Sm
142Sm
62
80
141.915198(6)
72.49(5) min
β+
142Pm
0+
143Sm
62
81
142.914628(4)
8.75(8) min
β+
143Pm
3/2+
143m1Sm
753.99(16) keV
66(2) s
IT (99.76%)
143Sm
11/2-
β+ (.24%)
143Pm
143m2Sm
2793.8(13) keV
30(3) ms
23/2(-)
144Sm
62
82
143.911999(3)
观测上稳定
0+
0.0307(7)
144mSm
2323.60(8) keV
880(25) ns
6+
145Sm
62
83
144.913410(3)
340(3) d
EC
145Pm
7/2-
145mSm
8786.2(7) keV
990(170) ns0.96(+19-15) µs
(49/2+)
146Sm
62
84
145.913041(4)
9.20(26)7 a
α
142Nd
0+
痕量
147Sm
62
85
146.9148979(26)
1.06(2)×1011 a
α
143Nd
7/2-
0.1499(18)
148Sm
62
86
147.9148227(26)
7(3)×1015 a
α
144Nd
0+
0.1124(10)
149Sm
62
87
148.9171847(26)
观测上稳定
7/2-
0.1382(7)
150Sm
62
88
149.9172755(26)
观测上稳定
0+
0.0738(1)
151Sm
62
89
150.9199324(26)
88.8(24) a
β-
151Eu
5/2-
151mSm
261.13(4) keV
1.4(1) µs
(11/2)-
152Sm
62
90
151.9197324(27)
观测上稳定
0+
0.2675(16)
153Sm
62
91
152.9220974(27)
46.284(4) h
β-
153Eu
3/2+
153mSm
98.37(10) keV
10.6(3) ms
IT
153Sm
11/2-
154Sm
62
92
153.9222093(27)
观测上稳定
0+
0.2275(29)
155Sm
62
93
154.9246402(28)
22.3(2) min
β-
155Eu
3/2-
156Sm
62
94
155.925528(10)
9.4(2) h
β-
156Eu
0+
156mSm
1397.55(9) keV
185(7) ns
5-
157Sm
62
95
156.92836(5)
8.03(7) min
β-
157Eu
(3/2-)
158Sm
62
96
157.92999(8)
5.30(3) min
β-
158Eu
0+
159Sm
62
97
158.93321(11)
11.37(15) s
β-
159Eu
5/2-
160Sm
62
98
159.93514(21)#
9.6(3) s
β-
160Eu
0+
161Sm
62
99
160.93883(32)#
4.8(8) s
β-
161Eu
7/2+#
162Sm
62
100
161.94122(54)#
2.4(5) s
β-
162Eu
0+
163Sm
62
101
162.94536(75)#
1# s
β-
163Eu
1/2-#
164Sm
62
102
163.94828(86)#
500# ms
β-
164Eu
0+
165Sm
62
103
164.95298(97)#
200# ms
β-
165Eu
5/2-#

**参考文献**
 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) date=20110324090740 . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and  Atomic Weights Revised (2005) date=20080305062433 .- 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 date=20110716114059 , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the  NuDat 2.1 database date=20190513230730  (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.