Gd
Gadolinium
Z 64 157.249 g/molLanthanide
| 158Gd | 94 | 157.9241 | -70,690.0 | 24.84% | Stable | 0+ | --- | 1933 |
| 160Gd | 96 | 159.9271 | -67,942.1 | 21.86% | Stable | 0+ | β⁻ | 1933 |
| 156Gd | 92 | 155.9221 | -72,535.3 | 20.47% | Stable | 0+ | --- | 1933 |
| 157Gd | 93 | 156.924 | -70,823.9 | 15.65% | Stable | 3/2- | --- | 1933 |
| 155Gd | 91 | 154.9226 | -72,070.3 | 14.8% | Stable | 3/2- | --- | 1933 |
| 154Gd | 90 | 153.9209 | -73,706.4 | 2.18% | Stable | 0+ | --- | 1938 |
| 152Gd | 88 | 151.9198 | -74,707.3 | 0.2% | 108.0 Ty | 0+ | α→148Sm(100%) β⁺ | 1938 |
| 133Gd | 69 | 132.9613 | -36,060.0 | --- | 10.0 ms | (5/2+) | β⁺→133Eu β⁺p→132Sm | --- |
| 134Gd | 70 | 133.9554 | -41,530.0 | --- | 400.0 ms | 0+ | β⁺→134Eu β⁺p→133Sm | --- |
| 135Gd | 71 | 134.9525 | -44,250.0 | --- | 1.1 s | (5/2+) | β⁺→135Eu(98%) β⁺p→134Sm(2%) | 1996 |
| 136Gd | 72 | 135.9473 | -49,090.0 | --- | 1.0 s | 0+ | β⁺→136Eu β⁺p→135Sm | 2000 |
| 137Gd | 73 | 136.945 | -51,210.0 | --- | 2.2 s | (7/2+) | β⁺→137Eu(100%) β⁺p→136Sm | 1999 |
| 138Gd | 74 | 137.9402 | -55,660.0 | --- | 4.7 s | 0+ | β⁺→138Eu(100%) | 1985 |
| 138mGd | 74 | 137.9426 | -53,430.0 | --- | 6.2 µs | (8-) | γ→138Gd(100%) | 1997 |
| 139Gd | 75 | 138.9381 | -57,630.0 | --- | 5.7 s | (9/2-) | β⁺→139Eu(100%) β⁺p→138Sm | 1983 |
| 139mGd | 75 | 138.9384 | -57,380.0 | --- | 4.8 s | (1/2+) | β⁺→139Eu(100%) β⁺p→138Sm | 1983 |
| 140Gd | 76 | 139.9337 | -61,782.0 | --- | 15.8 s | 0+ | β⁺→140Eu(100%) β⁺(67%) EC→140Eu(33%) | 1985 |
| 141Gd | 77 | 140.9321 | -63,224.0 | --- | 14.0 s | (1/2+) | β⁺→141Eu(99.97%) β⁺p→140Sm(0.03%) | 1986 |
| 141mGd | 77 | 140.9325 | -62,846.0 | --- | 24.5 s | (11/2-) | β⁺→141Eu(89%) γ→141Gd(11%) | 1986 |
| 142Gd | 78 | 141.9281 | -66,960.0 | --- | 1.17 m | 0+ | β⁺→142Eu(100%) EC→142Eu(52%) β⁺(48%) | 1986 |
| 143Gd | 79 | 142.9268 | -68,230.0 | --- | 39.0 s | 1/2+ | β⁺→143Eu(100%) β⁺p→142Sm β⁺α→139Pm | 1975 |
| 143mGd | 79 | 142.9269 | -68,080.0 | --- | 1.83 m | 11/2- | β⁺→143Eu(100%) β⁺p→142Sm β⁺α→139Pm | 1973 |
| 144Gd | 80 | 143.923 | -71,760.0 | --- | 4.47 m | 0+ | β⁺→144Eu(100%) | 1968 |
| 144mGd | 80 | 143.9266 | -68,327.0 | --- | 145.0 ns | (10+) | γ→144Gd(100%) | 1978 |
| 145Gd | 81 | 144.9217 | -72,927.0 | --- | 23.0 m | 1/2+ | β⁺→145Eu(100%) | 1959 |
| 145mGd | 81 | 144.9225 | -72,178.0 | --- | 1.42 m | 11/2- | γ→145Gd(94.3%) β⁺→145Eu(5.7%) | 1969 |
| 146Gd | 82 | 145.9183 | -76,086.0 | --- | 48.27 d | 0+ | EC→146Eu(100%) | 1957 |
| 147Gd | 83 | 146.9191 | -75,356.9 | --- | 1.59 d | 7/2- | β⁺→147Eu(100%) | 1957 |
| 147mGd | 83 | 146.9283 | -66,769.1 | --- | 510.0 ns | 49/2+ | γ→147Gd(100%) | 1982 |
| 148Gd | 84 | 147.9181 | -76,269.4 | --- | 71.3 y | 0+ | α→144Sm(100%) β⁺ | 1953 |
| 149Gd | 85 | 148.9193 | -75,127.0 | --- | 9.28 d | 7/2- | β⁺→149Eu(~100%) α→145Sm(4.3e-4%) | 1951 |
| 150Gd | 86 | 149.9187 | -75,764.0 | --- | 1.79 My | 0+ | α→146Sm(100%) β⁺ | 1953 |
| 151Gd | 87 | 150.9204 | -74,188.9 | --- | 123.9 d | 7/2- | EC→151Eu(~100%) α→147Sm(1.1e-6%) | 1950 |
| 153Gd | 89 | 152.9218 | -72,882.9 | --- | 240.6 d | 3/2- | EC→153Eu(100%) | 1947 |
| 153mGd | 89 | 152.9219 | -72,787.7 | --- | 3.5 µs | 9/2+ | γ→153Gd(100%) | 1979 |
| 153nGd | 89 | 152.9219 | -72,711.7 | --- | 76.0 µs | (11/2-) | γ→153Gd(100%) | 1967 |
| 155mGd | 91 | 154.9228 | -71,949.2 | --- | 31.97 ms | 11/2- | γ→155Gd(100%) | 1967 |
| 156mGd | 92 | 155.9244 | -70,397.7 | --- | 1.3 µs | 7- | γ→156Gd(100%) | 1969 |
| 157mGd | 93 | 156.924 | -70,760.0 | --- | 460.0 ns | 5/2+ | γ→157Gd(100%) | 1964 |
| 157nGd | 93 | 156.9244 | -70,397.4 | --- | 18.5 µs | 11/2- | γ→157Gd(100%) | 1961 |
| 159Gd | 95 | 158.9264 | -68,561.9 | --- | 18.48 h | 3/2- | β⁻→159Tb(100%) | 1949 |
| 161Gd | 97 | 160.9297 | -65,506.1 | --- | 3.65 m | 5/2- | β⁻→161Tb(100%) | 1949 |
| 162Gd | 98 | 161.931 | -64,281.0 | --- | 8.4 m | 0+ | β⁻→162Tb(100%) | 1967 |
| 163Gd | 99 | 162.9341 | -61,388.6 | --- | 1.13 m | 7/2+ | β⁻→163Tb(100%) | 1982 |
| 163mGd | 99 | 162.9342 | -61,250.4 | --- | 23.5 s | 1/2- | γ→163Gd β⁻→163Tb | 2014 |
| 164Gd | 100 | 163.9359 | -59,693.7 | --- | 45.0 s | 0+ | β⁻→164Tb(100%) | 1988 |
| 164mGd | 100 | 163.9371 | -58,597.9 | --- | 589.0 ns | (4-) | γ→164Gd(100%) | 2017 |
| 165Gd | 101 | 164.9393 | -56,525.8 | --- | 11.6 s | (1/2-) | β⁻→165Tb(100%) | 1998 |
| 166Gd | 102 | 165.9416 | -54,370.9 | --- | 5.1 s | 0+ | β⁻→166Tb(100%) | 2005 |
| 166mGd | 102 | 165.9433 | -52,769.4 | --- | 950.0 ns | (6-) | γ→166Gd(100%) | 2014 |
| 167Gd | 103 | 166.9455 | -50,776.0 | --- | 4.2 s | (5/2-) | β⁻→167Tb(100%) | 2012 |
| 168Gd | 104 | 167.9483 | -48,150.0 | --- | 3.03 s | 0+ | β⁻→168Tb(100%) | 1985 |
| 169Gd | 105 | 168.9529 | -43,890.0 | --- | 750.0 ms | (7/2-) | β⁻→169Tb(100%) β⁻n→168Tb | 2012 |
| 170Gd | 106 | 169.9561 | -40,850.0 | --- | 420.0 ms | 0+ | β⁻→170Tb(100%) β⁻n→169Tb | 2012 |
| 171Gd | 107 | 170.9611 | -36,210.0 | --- | 300.0 ms | (9/2+) | β⁻→171Tb β⁻n→170Tb | 2018 |
| 172Gd | 108 | 171.9646 | -32,970.0 | --- | 160.0 ms | (0+) | β⁻→172Tb β⁻n→171Tb | 2018 |