ガドリニウムの同位体
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) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 134Gd | 64 | 70 | 133.95537(43)# | 0.4# s | 0+ |  |  |
| 135Gd | 64 | 71 | 134.95257(54)# | 1.1(2) s | 3/2- |  |  |
| 136Gd | 64 | 72 | 135.94734(43)# | 1# s [>200 ns] |  |  |  |
| 137Gd | 64 | 73 | 136.94502(43)# | 2.2(2) s | 7/2+# |  |  |
| 138Gd | 64 | 74 | 137.94012(21)# | 4.7(9) s | 0+ |  |  |
| 138mGd | 2232.7(11) keV | 2232.7(11) keV | 2232.7(11) keV | 6(1) µs | (8-) |  |  |
| 139Gd | 64 | 75 | 138.93824(21)# | 5.7(3) s | 9/2-# |  |  |
| 139mGd | 250(150)# keV | 250(150)# keV | 250(150)# keV | 4.8(9) s | 1/2+# |  |  |
| 140Gd | 64 | 76 | 139.93367(3) | 15.8(4) s | 0+ |  |  |
| 141Gd | 64 | 77 | 140.932126(21) | 14(4) s | (1/2+) |  |  |
| 141mGd | 377.8(2) keV | 377.8(2) keV | 377.8(2) keV | 24.5(5) s | (11/2-) |  |  |
| 142Gd | 64 | 78 | 141.92812(3) | 70.2(6) s | 0+ |  |  |
| 143Gd | 64 | 79 | 142.92675(22) | 39(2) s | (1/2)+ |  |  |
| 143mGd | 152.6(5) keV | 152.6(5) keV | 152.6(5) keV | 110.0(14) s | (11/2-) |  |  |
| 144Gd | 64 | 80 | 143.92296(3) | 4.47(6) min | 0+ |  |  |
| 145Gd | 64 | 81 | 144.921709(20) | 23.0(4) min | 1/2+ |  |  |
| 145mGd | 749.1(2) keV | 749.1(2) keV | 749.1(2) keV | 85(3) s | 11/2- |  |  |
| 146Gd | 64 | 82 | 145.918311(5) | 48.27(10) d | 0+ |  |  |
| 147Gd | 64 | 83 | 146.919094(3) | 38.06(12) h | 7/2- |  |  |
| 147mGd | 8587.8(4) keV | 8587.8(4) keV | 8587.8(4) keV | 510(20) ns | (49/2+) |  |  |
| 148Gd | 64 | 84 | 147.918115(3) | 74.6(30) a | 0+ |  |  |
| 149Gd | 64 | 85 | 148.919341(4) | 9.28(10) d | 7/2- |  |  |
| 150Gd | 64 | 86 | 149.918659(7) | 1.79(8)E+6 a | 0+ |  |  |
| 151Gd | 64 | 87 | 150.920348(4) | 124(1) d | 7/2- |  |  |
| 152Gd | 64 | 88 | 151.9197910(27) | 1.08(8)E+14 a | 0+ | 0.0020(1) |  |
| 153Gd | 64 | 89 | 152.9217495(27) | 240.4(10) d | 3/2- |  |  |
| 153m1Gd | 95.1737(12) keV | 95.1737(12) keV | 95.1737(12) keV | 3.5(4) µs | (9/2+) |  |  |
| 153m2Gd | 171.189(5) keV | 171.189(5) keV | 171.189(5) keV | 76.0(14) µs | (11/2-) |  |  |
| 154Gd | 64 | 90 | 153.9208656(27) | STABLE | 0+ | 0.0218(3) |  |
| 155Gd | 64 | 91 | 154.9226220(27) | STABLE | 3/2- | 0.1480(12) |  |
| 155mGd | 121.05(19) keV | 121.05(19) keV | 121.05(19) keV | 31.97(27) ms | 11/2- |  |  |
| 156Gd | 64 | 92 | 155.9221227(27) | STABLE | 0+ | 0.2047(9) |  |
| 156mGd | 2137.60(5) keV | 2137.60(5) keV | 2137.60(5) keV | 1.3(1) µs | 7- |  |  |
| 157Gd | 64 | 93 | 156.9239601(27) | STABLE | 3/2- | 0.1565(2) |  |
| 158Gd | 64 | 94 | 157.9241039(27) | STABLE | 0+ | 0.2484(7) |  |
| 159Gd | 64 | 95 | 158.9263887(27) | 18.479(4) h | 3/2- |  |  |
| 160Gd | 64 | 96 | 159.9270541(27) | STABLE [>13E+20 a] | 0+ | 0.2186(19) |  |
| 161Gd | 64 | 97 | 160.9296692(29) | 3.646(3) min | 5/2- |  |  |
| 162Gd | 64 | 98 | 161.930985(5) | 8.4(2) min | 0+ |  |  |
| 163Gd | 64 | 99 | 162.93399(32)# | 68(3) s | 7/2+# |  |  |
| 164Gd | 64 | 100 | 163.93586(43)# | 45(3) s | 0+ |  |  |
| 165Gd | 64 | 101 | 164.93938(54)# | 10.3(16) s | 1/2-# |  |  |
| 166Gd | 64 | 102 | 165.94160(64)# | 4.8(10) s | 0+ |  |  |
| 167Gd | 64 | 103 | 166.94557(64)# | 3# s | 5/2-# |  |  |
| 168Gd | 64 | 104 | 167.94836(75)# | 300# ms | 0+ |  |  |
| 169Gd | 64 | 105 | 168.95287(86)# | 1# s | 7/2-# |  |  |