Table
| nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s) |
daughter isotope(s) |
nuclear spin |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
|---|---|---|---|---|---|---|---|---|---|
| excitation energy | |||||||||
| 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 | β+ | 136Eu | |||
| 137Gd | 64 | 73 | 136.94502(43)# | 2.2(2) s | β+ | 137Eu | 7/2+# | ||
| β+, p (rare) | 136Sm | ||||||||
| 138Gd | 64 | 74 | 137.94012(21)# | 4.7(9) s | β+ | 138Eu | 0+ | ||
| 138mGd | 2232.7(11) keV | 6(1) µs | (8-) | ||||||
| 139Gd | 64 | 75 | 138.93824(21)# | 5.7(3) s | β+ | 139Eu | 9/2-# | ||
| β+, p (rare) | 138Sm | ||||||||
| 139mGd | 250(150)# keV | 4.8(9) s | 1/2+# | ||||||
| 140Gd | 64 | 76 | 139.93367(3) | 15.8(4) s | β+ | 140Eu | 0+ | ||
| 141Gd | 64 | 77 | 140.932126(21) | 14(4) s | β+ (99.97%) | 141Eu | (1/2+) | ||
| β+, p (.03%) | 140Sm | ||||||||
| 141mGd | 377.8(2) keV | 24.5(5) s | β+ (89%) | 141Eu | (11/2-) | ||||
| IT (11%) | 141Gd | ||||||||
| 142Gd | 64 | 78 | 141.92812(3) | 70.2(6) s | β+ | 142Eu | 0+ | ||
| 143Gd | 64 | 79 | 142.92675(22) | 39(2) s | β+ | 143Eu | (1/2)+ | ||
| β+, α (rare) | 139Pm | ||||||||
| β+, p (rare) | 142Sm | ||||||||
| 143mGd | 152.6(5) keV | 110.0(14) s | β+ | 143Eu | (11/2-) | ||||
| β+, α (rare) | 139Pm | ||||||||
| β+, p (rare) | 142Sm | ||||||||
| 144Gd | 64 | 80 | 143.92296(3) | 4.47(6) min | β+ | 144Eu | 0+ | ||
| 145Gd | 64 | 81 | 144.921709(20) | 23.0(4) min | β+ | 145Eu | 1/2+ | ||
| 145mGd | 749.1(2) keV | 85(3) s | IT (94.3%) | 145Gd | 11/2- | ||||
| β+ (5.7%) | 145Eu | ||||||||
| 146Gd | 64 | 82 | 145.918311(5) | 48.27(10) d | EC | 146Eu | 0+ | ||
| 147Gd | 64 | 83 | 146.919094(3) | 38.06(12) h | β+ | 147Eu | 7/2- | ||
| 147mGd | 8587.8(4) keV | 510(20) ns | (49/2+) | ||||||
| 148Gd | 64 | 84 | 147.918115(3) | 74.6(30) a | α | 144Sm | 0+ | ||
| β+β+ (rare) | 148Sm | ||||||||
| 149Gd | 64 | 85 | 148.919341(4) | 9.28(10) d | β+ | 149Eu | 7/2- | ||
| α (4.34×10−4%) | 145Sm | ||||||||
| 150Gd | 64 | 86 | 149.918659(7) | 1.79(8)×106 a | α | 146Sm | 0+ | ||
| β+β+ (rare) | 150Sm | ||||||||
| 151Gd | 64 | 87 | 150.920348(4) | 124(1) d | EC | 151Eu | 7/2- | ||
| α (10−6%) | 147Sm | ||||||||
| 152Gd | 64 | 88 | 151.9197910(27) | 1.08(8)×1014 a | α | 148Sm | 0+ | 0.0020(1) | |
| 153Gd | 64 | 89 | 152.9217495(27) | 240.4(10) d | EC | 153Eu | 3/2- | ||
| 153m1Gd | 95.1737(12) keV | 3.5(4) µs | (9/2+) | ||||||
| 153m2Gd | 171.189(5) keV | 76.0(14) µs | (11/2-) | ||||||
| 154Gd | 64 | 90 | 153.9208656(27) | Observationally Stable | 0+ | 0.0218(3) | |||
| 155Gd | 64 | 91 | 154.9226220(27) | Observationally Stable | 3/2- | 0.1480(12) | |||
| 155mGd | 121.05(19) keV | 31.97(27) ms | IT | 155Gd | 11/2- | ||||
| 156Gd | 64 | 92 | 155.9221227(27) | Stable | 0+ | 0.2047(9) | |||
| 156mGd | 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 | β- | 159Tb | 3/2- | ||
| 160Gd | 64 | 96 | 159.9270541(27) | Observationally Stable | 0+ | 0.2186(19) | |||
| 161Gd | 64 | 97 | 160.9296692(29) | 3.646(3) min | β- | 161Tb | 5/2- | ||
| 162Gd | 64 | 98 | 161.930985(5) | 8.4(2) min | β- | 162Tb | 0+ | ||
| 163Gd | 64 | 99 | 162.93399(32)# | 68(3) s | β- | 163Tb | 7/2+# | ||
| 164Gd | 64 | 100 | 163.93586(43)# | 45(3) s | β- | 164Tb | 0+ | ||
| 165Gd | 64 | 101 | 164.93938(54)# | 10.3(16) s | β- | 165Tb | 1/2-# | ||
| 166Gd | 64 | 102 | 165.94160(64)# | 4.8(10) s | β- | 166Tb | 0+ | ||
| 167Gd | 64 | 103 | 166.94557(64)# | 3# s | β- | 167Tb | 5/2-# | ||
| 168Gd | 64 | 104 | 167.94836(75)# | 300# ms | β- | 168Tb | 0+ | ||
| 169Gd | 64 | 105 | 168.95287(86)# | 1# s | β- | 169Tb | 7/2-# | ||
Read more about this topic: Isotopes Of Gadolinium
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