エルビウムの同位体
一覧

| 同位体核種 | Z(p)> 励起エネルギー | N(n)> 励起エネルギー | 同位体質量 (u)> 励起エネルギー | 半減期 | 核スピン数 | 天然存在比 | 天然存在比 (範囲) |
| --- | --- | --- | --- | --- | --- | --- | --- |

| 143Er | 68 | 75 | 142.96634(64)# | 200# ms | 9/2-# |  |  |
| 144Er | 68 | 76 | 143.96038(43)# | 400# ms [>200 ns] | 0+ |  |  |
| 145Er | 68 | 77 | 144.95739(43)# | 900(300) ms | 1/2+# |  |  |
| 146Er | 68 | 78 | 145.95200(32)# | 1.7(6) s | 0+ |  |  |
| 147Er | 68 | 79 | 146.94949(32)# | ~2.5 s | (1/2+) |  |  |
| 147mEr | 100(50)# keV | 100(50)# keV | 100(50)# keV | 2.5(2) s | (11/2-) |  |  |
| 148Er | 68 | 80 | 147.94455(21)# | 4.6(2) s | 0+ |  |  |
| 149Er | 68 | 81 | 148.94231(3) | 4(2) s | (1/2+) |  |  |
| 149m1Er | 741.8(2) keV | 741.8(2) keV | 741.8(2) keV | 8.9(2) s | (11/2-) |  |  |
| 149m2Er | 2611.1(3) keV | 2611.1(3) keV | 2611.1(3) keV | 0.61(8) µs | (19/2+) |  |  |
| 149m3Er | 3242.7+X keV | 3242.7+X keV | 3242.7+X keV | 4.8(1) µs | (27/2-) |  |  |
| 150Er | 68 | 82 | 149.937914(18) | 18.5(7) s | 0+ |  |  |
| 151Er | 68 | 83 | 150.937449(18) | 23.5(13) s | (7/2-) |  |  |
| 151m1Er | 2585.5(6) keV | 2585.5(6) keV | 2585.5(6) keV | 580(20) ms | (27/2-) |  |  |
| 151m2Er | 10286+X keV | 10286+X keV | 10286+X keV | 0.42(5) µs | (67/2,69/2,71/2) |  |  |
| 152Er | 68 | 84 | 151.935050(11) | 10.3(1) s | 0+ |  |  |
| 153Er | 68 | 85 | 152.935063(9) | 37.1(2) s | 7/2(-) |  |  |
| 154Er | 68 | 86 | 153.932783(6) | 3.73(9) min | 0+ |  |  |
| 155Er | 68 | 87 | 154.933209(7) | 5.3(3) min | 7/2- |  |  |
| 156Er | 68 | 88 | 155.931065(26) | 19.5(10) min | 0+ |  |  |
| 157Er | 68 | 89 | 156.93192(3) | 18.65(10) min | 3/2- |  |  |
| 157mEr | 155.4(3) keV | 155.4(3) keV | 155.4(3) keV | 76(6) ms | (9/2+) |  |  |
| 158Er | 68 | 90 | 157.929893(27) | 2.29(6) h | 0+ |  |  |
| 159Er | 68 | 91 | 158.930684(5) | 36(1) min | 3/2- |  |  |
| 159m1Er | 182.602(24) keV | 182.602(24) keV | 182.602(24) keV | 337(14) ns | 9/2+ |  |  |
| 159m2Er | 429.05(3) keV | 429.05(3) keV | 429.05(3) keV | 590(60) ns | 11/2- |  |  |
| 160Er | 68 | 92 | 159.929083(26) | 28.58(9) h | 0+ |  |  |
| 161Er | 68 | 93 | 160.929995(10) | 3.21(3) h | 3/2- |  |  |
| 161mEr | 396.44(4) keV | 396.44(4) keV | 396.44(4) keV | 7.5(7) µs | 11/2- |  |  |
| 162Er | 68 | 94 | 161.928778(4) | STABLE [>140E+12 a] | 0+ | 0.00139(5) |  |
| 163Er | 68 | 95 | 162.930033(6) | 75.0(4) min | 5/2- |  |  |
| 163mEr | 445.5(6) keV | 445.5(6) keV | 445.5(6) keV | 580(100) ns | (11/2-) |  |  |
| 164Er | 68 | 96 | 163.929200(3) | STABLE | 0+ | 0.01601(3) |  |
| 165Er | 68 | 97 | 164.930726(3) | 10.36(4) h | 5/2- |  |  |
| 166Er | 68 | 98 | 165.9302931(27) | STABLE | 0+ | 0.33503(36) |  |
| 167Er | 68 | 99 | 166.9320482(27) | STABLE | 7/2+ | 0.22869(9) |  |
| 167mEr | 207.801(5) keV | 207.801(5) keV | 207.801(5) keV | 2.269(6) s | 1/2- |  |  |
| 168Er | 68 | 100 | 167.9323702(27) | STABLE | 0+ | 0.26978(18) |  |
| 169Er | 68 | 101 | 168.9345904(27) | 9.392(18) d | 1/2- |  |  |
| 170Er | 68 | 102 | 169.9354643(30) | STABLE [>320E+15 a] | 0+ | 0.14910(36) |  |
| 171Er | 68 | 103 | 170.9380298(30) | 7.516(2) h | 5/2- |  |  |
| 171mEr | 198.6(1) keV | 198.6(1) keV | 198.6(1) keV | 210(10) ns | 1/2- |  |  |
| 172Er | 68 | 104 | 171.939356(5) | 49.3(3) h | 0+ |  |  |
| 173Er | 68 | 105 | 172.94240(21)# | 1.434(17) min | (7/2-) |  |  |
| 174Er | 68 | 106 | 173.94423(32)# | 3.2(2) min | 0+ |  |  |
| 175Er | 68 | 107 | 174.94777(43)# | 1.2(3) min | (9/2+) |  |  |
| 176Er | 68 | 108 | 175.95008(43)# | 20# s | 0+ |  |  |
| 177Er | 68 | 109 | 176.95405(54)# | 3# s | 1/2-# |  |  |