銪的同位素
圖表

| 符號 | Z> 激發能量 | N> 激發能量 | 同位素質量（u） > 激發能量 | 半衰期 | 衰變方式 | 衰變產物 | 原子核 自旋 | 相對豐度 （莫耳分率） |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 130Eu | 63 | 67 | 129.96357(54)# | 1.1(5) ms [0.9(+5-3) ms] |  |  | 2+# |  |
| 131Eu | 63 | 68 | 130.95775(43)# | 17.8(19) ms |  |  | 3/2+ |  |
| 132Eu | 63 | 69 | 131.95437(43)# | 100# ms | β+ | 132Sm |  |  |
| 132Eu | 63 | 69 | 131.95437(43)# | 100# ms | p | 131Sm |  |  |
| 133Eu | 63 | 70 | 132.94924(32)# | 200# ms | β+ | 133Sm | 11/2-# |  |
| 134Eu | 63 | 71 | 133.94651(21)# | 0.5(2) s | β+ | 134Sm |  |  |
| 134Eu | 63 | 71 | 133.94651(21)# | 0.5(2) s | β+, p （不常見） | 133Pm |  |  |
| 135Eu | 63 | 72 | 134.94182(32)# | 1.5(2) s | β+ | 135Sm | 11/2-# |  |
| 135Eu | 63 | 72 | 134.94182(32)# | 1.5(2) s | β+, p | 134Pm | 11/2-# |  |
| 136Eu | 63 | 73 | 135.93960(21)# | 3.3(3) s | β+ (99.91%) | 136Sm | (7+) |  |
| 136Eu | 63 | 73 | 135.93960(21)# | 3.3(3) s | β+, p (.09%) | 135Pm | (7+) |  |
| 136mEu | 0(500)# keV | 0(500)# keV | 0(500)# keV | 3.8(3) s | β+ (99.91%) | 136Sm | (3+) |  |
| 136mEu | 0(500)# keV | 0(500)# keV | 0(500)# keV | 3.8(3) s | β+, p (.09%) | 135Pm | (3+) |  |
| 137Eu | 63 | 74 | 136.93557(21)# | 8.4(5) s | β+ | 137Sm | 11/2-# |  |
| 138Eu | 63 | 75 | 137.93371(3) | 12.1(6) s | β+ | 138Sm | (6-) |  |
| 139Eu | 63 | 76 | 138.929792(14) | 17.9(6) s | β+ | 139Sm | (11/2)- |  |
| 140Eu | 63 | 77 | 139.92809(6) | 1.51(2) s | β+ | 140Sm | 1+ |  |
| 140mEu | 210(15) keV | 210(15) keV | 210(15) keV | 125(2) ms | IT (99%) | 140Eu | 5-# |  |
| 140mEu | 210(15) keV | 210(15) keV | 210(15) keV | 125(2) ms | β+(1%) | 140Sm | 5-# |  |
| 141Eu | 63 | 78 | 140.924931(14) | 40.7(7) s | β+ | 141Sm | 5/2+ |  |
| 141mEu | 96.45(7) keV | 96.45(7) keV | 96.45(7) keV | 2.7(3) s | IT (86%) | 141Eu | 11/2- |  |
| 141mEu | 96.45(7) keV | 96.45(7) keV | 96.45(7) keV | 2.7(3) s | β+ (14%) | 141Sm | 11/2- |  |
| 142Eu | 63 | 79 | 141.92343(3) | 2.36(10) s | β+ | 142Sm | 1+ |  |
| 142mEu | 460(30) keV | 460(30) keV | 460(30) keV | 1.223(8) min | β+ | 142Sm | 8- |  |
| 143Eu | 63 | 80 | 142.920298(12) | 2.59(2) min | β+ | 143Sm | 5/2+ |  |
| 143mEu | 389.51(4) keV | 389.51(4) keV | 389.51(4) keV | 50.0(5) µs |  |  | 11/2- |  |
| 144Eu | 63 | 81 | 143.918817(12) | 10.2(1) s | β+ | 144Sm | 1+ |  |
| 144mEu | 1127.6(6) keV | 1127.6(6) keV | 1127.6(6) keV | 1.0(1) µs |  |  | (8-) |  |
| 145Eu | 63 | 82 | 144.916265(4) | 5.93(4) d | β+ | 145Sm | 5/2+ |  |
| 145mEu | 716.0(3) keV | 716.0(3) keV | 716.0(3) keV | 490 ns |  |  | 11/2- |  |
| 146Eu | 63 | 83 | 145.917206(7) | 4.61(3) d | β+ | 146Sm | 4- |  |
| 146mEu | 666.37(16) keV | 666.37(16) keV | 666.37(16) keV | 235(3) µs |  |  | 9+ |  |
| 147Eu | 63 | 84 | 146.916746(3) | 24.1(6) d | β+ (99.99%) | 147Sm | 5/2+ |  |
| 147Eu | 63 | 84 | 146.916746(3) | 24.1(6) d | α (.0022%) | 143Pm | 5/2+ |  |
| 148Eu | 63 | 85 | 147.918086(11) | 54.5(5) d | β+ (100%) | 148Sm | 5- |  |
| 148Eu | 63 | 85 | 147.918086(11) | 54.5(5) d | α (9.39×10−7%) | 144Pm | 5- |  |
| 149Eu | 63 | 86 | 148.917931(5) | 93.1(4) d | ε | 149Sm | 5/2+ |  |
| 150Eu | 63 | 87 | 149.919702(7) | 36.9(9) a | β+ | 150Sm | 5(-) |  |
| 150mEu | 42.1(5) keV | 42.1(5) keV | 42.1(5) keV | 12.8(1) h | β− (89%) | 150Gd | 0- |  |
| 150mEu | 42.1(5) keV | 42.1(5) keV | 42.1(5) keV | 12.8(1) h | β+ (11%) | 150Sm | 0- |  |
| 150mEu | 42.1(5) keV | 42.1(5) keV | 42.1(5) keV | 12.8(1) h | IT (5×10−8%) | 150Eu | 0- |  |
| 151Eu | 63 | 88 | 150.9198502(26) | 4.62×1018 a | α | 147Pm | 5/2+ | 0.4781(6) |
| 151mEu | 196.245(10) keV | 196.245(10) keV | 196.245(10) keV | 58.9(5) µs |  |  | 11/2- |  |
| 152Eu | 63 | 89 | 151.9217445(26) | 13.537(6) a | ε (72.09%), β+ (0.027%) | 152Sm | 3- |  |
| 152Eu | 63 | 89 | 151.9217445(26) | 13.537(6) a | β− (27.9%) | 152Gd | 3- |  |
| 152m1Eu | 45.5998(4) keV | 45.5998(4) keV | 45.5998(4) keV | 9.3116(13) h | β− (72%) | 152Gd | 0- |  |
| 152m1Eu | 45.5998(4) keV | 45.5998(4) keV | 45.5998(4) keV | 9.3116(13) h | β+ (28%) | 152Sm | 0- |  |
| 152m2Eu | 65.2969(4) keV | 65.2969(4) keV | 65.2969(4) keV | 0.94(8) µs |  |  | 1- |  |
| 152m3Eu | 78.2331(4) keV | 78.2331(4) keV | 78.2331(4) keV | 165(10) ns |  |  | 1+ |  |
| 152m4Eu | 89.8496(4) keV | 89.8496(4) keV | 89.8496(4) keV | 384(10) ns |  |  | 4+ |  |
| 152m5Eu | 147.86(10) keV | 147.86(10) keV | 147.86(10) keV | 96(1) min |  |  | 8- |  |
| 153Eu | 63 | 90 | 152.9212303(26) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 5/2+ | 0.5219(6) |
| 154Eu | 63 | 91 | 153.9229792(26) | 8.593(4) a | β− (99.98%) | 154Gd | 3- |  |
| 154Eu | 63 | 91 | 153.9229792(26) | 8.593(4) a | ε (.02%) | 154Sm | 3- |  |
| 154m1Eu | 145.3(3) keV | 145.3(3) keV | 145.3(3) keV | 46.3(4) min | IT | 154Eu | (8-) |  |
| 154m2Eu | 68.1702(4) keV | 68.1702(4) keV | 68.1702(4) keV | 2.2(1) µs |  |  | 2+ |  |
| 155Eu | 63 | 92 | 154.9228933(27) | 4.7611(13) a | β− | 155Gd | 5/2+ |  |
| 156Eu | 63 | 93 | 155.924752(6) | 15.19(8) d | β− | 156Gd | 0+ |  |
| 157Eu | 63 | 94 | 156.925424(6) | 15.18(3) h | β− | 157Gd | 5/2+ |  |
| 158Eu | 63 | 95 | 157.92785(8) | 45.9(2) min | β− | 158Gd | (1-) |  |
| 159Eu | 63 | 96 | 158.929089(8) | 18.1(1) min | β− | 159Gd | 5/2+ |  |
| 160Eu | 63 | 97 | 159.93197(22)# | 38(4) s | β− | 160Gd | 1(-) |  |
| 161Eu | 63 | 98 | 160.93368(32)# | 26(3) s | β− | 161Gd | 5/2+# |  |
| 162Eu | 63 | 99 | 161.93704(32)# | 10.6(10) s | β− | 162Gd |  |  |
| 163Eu | 63 | 100 | 162.93921(54)# | 6# s | β− | 163Gd | 5/2+# |  |
| 164Eu | 63 | 101 | 163.94299(64)# | 2# s | β− | 164Gd |  |  |
| 165Eu | 63 | 102 | 164.94572(75)# | 1# s | β− | 165Gd | 5/2+# |  |
| 166Eu | 63 | 103 | 165.94997(86)# | 400# ms | β− | 166Gd |  |  |
| 167Eu | 63 | 104 | 166.95321(86)# | 200# ms | β− | 167Gd | 5/2+# |  |
1 2 3 4  畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
1 2 3 4  用括號括起來的數據代表不確定性。
↑  半衰期超过5亿年的同位素以粗體表示。
↑  穩定的衰變產物以粗體表示。
↑  半衰期超过5亿年的衰变产物以粗斜体表示。
↑  原始（英语：）放射性核素
1 2 3 4  裂变产物
↑  被认为会α衰变成149Pm
| 0 | 1 | 2 |
| --- | --- | --- |

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| 釤的同位素 | 銪的同位素 | 釓的同位素 |