鑭的同位素
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） | 相對豐度 的變化量 （莫耳分率） |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 116La | 57 | 59 |  | 50(22) ms | p（~60%） | 115Ba |  |  |  |
| 116La | 57 | 59 |  | 50(22) ms | β+（~40%） | 116Ba |  |  |  |
| 117La | 57 | 60 | 116.95007(43)# | 23.5(26) ms | β+ | 117Ba | (3/2+,3/2−) |  |  |
| 117La | 57 | 60 | 116.95007(43)# | 23.5(26) ms | p | 116Ba | (3/2+,3/2−) |  |  |
| 117mLa | 151(12) keV | 151(12) keV | 151(12) keV | 10(5) ms |  |  | (9/2+) |  |  |
| 118La | 57 | 61 | 117.94673(32)# | 200# ms | β+ | 118Ba |  |  |  |
| 119La | 57 | 62 | 118.94099(43)# | 1# s | β+ | 119Ba | 11/2−# |  |  |
| 120La | 57 | 63 | 119.93807(54)# | 2.8(2) s | β+ | 120Ba |  |  |  |
| 120La | 57 | 63 | 119.93807(54)# | 2.8(2) s | β+, p | 119Cs |  |  |  |
| 121La | 57 | 64 | 120.93301(54)# | 5.3(2) s | β+ | 121Ba | 11/2−# |  |  |
| 121La | 57 | 64 | 120.93301(54)# | 5.3(2) s | β+, p | 120Cs | 11/2−# |  |  |
| 122La | 57 | 65 | 121.93071(32)# | 8.6(5) s | β+ | 122Ba |  |  |  |
| 122La | 57 | 65 | 121.93071(32)# | 8.6(5) s | β+, p | 121Cs |  |  |  |
| 123La | 57 | 66 | 122.92624(21)# | 17(3) s | β+ | 123Ba | 11/2−# |  |  |
| 124La | 57 | 67 | 123.92457(6) | 29.21(17) s | β+ | 124Ba | (7−,8−) |  |  |
| 124mLa | 100(100)# keV | 100(100)# keV | 100(100)# keV | 21(4) s |  |  | low(+#) |  |  |
| 125La | 57 | 68 | 124.920816(28) | 64.8(12) s | β+ | 125Ba | (11/2−) |  |  |
| 125mLa | 107.0(10) keV | 107.0(10) keV | 107.0(10) keV | 390(40) ms |  |  | (3/2+) |  |  |
| 126La | 57 | 69 | 125.91951(10) | 54(2) s | β+ | 126Ba | (5)(+#) |  |  |
| 126mLa | 210(410) keV | 210(410) keV | 210(410) keV | 20(20) s |  |  | (0−,1−,2−) |  |  |
| 127La | 57 | 70 | 126.916375(28) | 5.1(1) min | β+ | 127Ba | (11/2−) |  |  |
| 127mLa | 14.8(12) keV | 14.8(12) keV | 14.8(12) keV | 3.7(4) min | β+ | 127Ba | (3/2+) |  |  |
| 127mLa | 14.8(12) keV | 14.8(12) keV | 14.8(12) keV | 3.7(4) min | IT | 127La | (3/2+) |  |  |
| 128La | 57 | 71 | 127.91559(6) | 5.18(14) min | β+ | 128Ba | (5+) |  |  |
| 128mLa | 100(100)# keV | 100(100)# keV | 100(100)# keV | <1.4 min | IT | 128La | (1+,2−) |  |  |
| 129La | 57 | 72 | 128.912693(22) | 11.6(2) min | β+ | 129Ba | 3/2+ |  |  |
| 129mLa | 172.1(4) keV | 172.1(4) keV | 172.1(4) keV | 560(50) ms | IT | 129La | 11/2− |  |  |
| 130La | 57 | 73 | 129.912369(28) | 8.7(1) min | β+ | 130Ba | 3(+) |  |  |
| 131La | 57 | 74 | 130.91007(3) | 59(2) min | β+ | 131Ba | 3/2+ |  |  |
| 131mLa | 304.52(24) keV | 304.52(24) keV | 304.52(24) keV | 170(10) µs |  |  | 11/2− |  |  |
| 132La | 57 | 75 | 131.91010(4) | 4.8(2) h | β+ | 132Ba | 2− |  |  |
| 132mLa | 188.18(11) keV | 188.18(11) keV | 188.18(11) keV | 24.3(5) min | IT (76%) | 132La | 6− |  |  |
| 132mLa | 188.18(11) keV | 188.18(11) keV | 188.18(11) keV | 24.3(5) min | β+ (24%) | 132Ba | 6− |  |  |
| 133La | 57 | 76 | 132.90822(3) | 3.912(8) h | β+ | 133Ba | 5/2+ |  |  |
| 134La | 57 | 77 | 133.908514(21) | 6.45(16) min | β+ | 134Ba | 1+ |  |  |
| 135La | 57 | 78 | 134.906977(11) | 19.5(2) h | β+ | 135Ba | 5/2+ |  |  |
| 136La | 57 | 79 | 135.90764(6) | 9.87(3) min | β+ | 136Ba | 1+ |  |  |
| 136mLa | 255(9) keV | 255(9) keV | 255(9) keV | 114(3) ms | IT | 136La | (8)(−#) |  |  |
| 137La | 57 | 80 | 136.906494(14) | 6(2)×104 a | ε | 137Ba | 7/2+ |  |  |
| 138La | 57 | 81 | 137.907112(4) | 1.02(1)×1011 a | β+ (66.4%) | 138Ba | 5+ | 9.0(1)×10−4 |  |
| 138La | 57 | 81 | 137.907112(4) | 1.02(1)×1011 a | β− (33.6%) | 138Ce | 5+ | 9.0(1)×10−4 |  |
| 138mLa | 72.57(3) keV | 72.57(3) keV | 72.57(3) keV | 116(5) ns |  |  | (3)+ |  |  |
| 139La | 57 | 82 | 138.9063533(26) | 稳定 | 稳定 | 稳定 | 7/2+ | 0.99910(1) |  |
| 140La | 57 | 83 | 139.9094776(26) | 1.6781(3) d | β− | 140Ce | 3− |  |  |
| 141La | 57 | 84 | 140.910962(5) | 3.92(3) h | β− | 141Ce | (7/2+) |  |  |
| 142La | 57 | 85 | 141.914079(6) | 91.1(5) min | β− | 142Ce | 2− |  |  |
| 143La | 57 | 86 | 142.916063(17) | 14.2(1) min | β− | 143Ce | (7/2)+ |  |  |
| 144La | 57 | 87 | 143.91960(5) | 40.8(4) s | β− | 144Ce | (3−) |  |  |
| 145La | 57 | 88 | 144.92165(10) | 24.8(20) s | β− | 145Ce | (5/2+) |  |  |
| 146La | 57 | 89 | 145.92579(8) | 6.27(10) s | β− (99.99%) | 146Ce | 2− |  |  |
| 146La | 57 | 89 | 145.92579(8) | 6.27(10) s | β−, n (.007%) | 145Ce | 2− |  |  |
| 146mLa | 130(130) keV | 130(130) keV | 130(130) keV | 10.0(1) s | β− | 146Ce | (6−) |  |  |
| 147La | 57 | 90 | 146.92824(5) | 4.015(8) s | β− (99.96%) | 147Ce | (5/2+) |  |  |
| 147La | 57 | 90 | 146.92824(5) | 4.015(8) s | β−, n (.04%) | 146Ce | (5/2+) |  |  |
| 148La | 57 | 91 | 147.93223(6) | 1.26(8) s | β− (99.85%) | 148Ce | (2−) |  |  |
| 148La | 57 | 91 | 147.93223(6) | 1.26(8) s | β−, n (.15%) | 147Ce | (2−) |  |  |
| 149La | 57 | 92 | 148.93473(34)# | 1.05(3) s | β− (98.6%) | 149Ce | 5/2+# |  |  |
| 149La | 57 | 92 | 148.93473(34)# | 1.05(3) s | β−, n (1.4%) | 148Ce | 5/2+# |  |  |
| 150La | 57 | 93 | 149.93877(43)# | 510(30) ms | β− (97.3%) | 150Ce | (3+) |  |  |
| 150La | 57 | 93 | 149.93877(43)# | 510(30) ms | β−, n (2.7%) | 149Ce | (3+) |  |  |
| 151La | 57 | 94 | 150.94172(43)# | 300# ms [>300 ns] | β− | 151Ce | 5/2+# |  |  |
| 152La | 57 | 95 | 151.94625(43)# | 200# ms [>300 ns] | β− | 152Ce |  |  |  |
| 153La | 57 | 96 | 152.94962(64)# | 150# ms [>300 ns] | β− | 153Ce | 5/2+# |  |  |
| 154La | 57 | 97 | 153.95450(64)# | 100# ms | β− | 154Ce |  |  |  |
| 155La | 57 | 98 | 154.95835(86)# | 60# ms | β− | 155Ce | 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。
↑  原生（英语：）放射性同位素
1 2  裂变产物
| 0 | 1 | 2 |
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