| Nuc- lide | Atomic Mass | NN | Abun % | Spin | Half Life | DM | DT | BR % | Decay Energy (MeV) |
|---|---|---|---|---|---|---|---|---|---|
| Gd136 | 135.947 | 72 | Syn | ||||||
| Gd137 | 136.945 | 73 | Syn | 7s | ε | Eu137 | 8.800 | ||
| Gd138 | 137.94 | 74 | Syn | 0+ | |||||
| Gd139 | 138.938 | 75 | Syn | 4.9s | ε | Eu139 | 7.700 | ||
| 4.9s | ε + P | Sm138 | 6.300 | ||||||
| Gd140 | 139.934 | 76 | Syn | 0+ | 15.8s | ε | Eu140 | 5.500 | |
| Gd141 | 140.932 | 77 | Syn | 1/2+ | 14s | ε + P | Sm140 | 0.03 | 4.900 |
| 14s | ε | Eu141 | 7.200 | ||||||
| meta state 0.378MeV | Syn | 11/2- | 24.5s | ε | Eu141 | 89 | 7.578 | ||
| 24.5s | IT | 11 | 0.378 | ||||||
| Gd142 | 141.928 | 78 | Syn | o+ | 70.2s | ε | Eu142 | 4.500 | |
| Gd143 | 142.927 | 79 | Syn | 1/2+ | 39s | ε | Eu143 | 6.010 | |
| meta state 0.153MeV | Syn | 11/2- | 112s | ε | Eu143 | 6.163 | |||
| Gd144 | 143.923 | 80 | Syn | 0+ | 4.5m | ε | Eu144 | 3.740 | |
| Gd145 | 144.9217 | 81 | Syn | 1/2+ | 23m | ε | Eu145 | 5.050 | |
| meta state 0.748MeV | Syn | 11/2- | 85s | IT | 94.3 | 0.749 | |||
| 85s | ε | Eu145 | 5.7 | 5.799 | |||||
| Gd146 | 145.9183 | 82 | Syn | 0+ | 48.27d | ε | Eu146 | 1.030 | |
| Gd147 | 146.9191 | 83 | Syn | 7/2- | 38.06h | ε | Eu147 | 2.187 | |
| Gd148 | 147.9181 | 84 | Syn | 0+ | 74.6y | α | Sm144 | 3.271 | |
| Gd149 | 148.9193 | 85 | Syn | 7/2- | 9.28d | α | Sm145 | 0.00043 | 3.100 |
| 9.28d | ε | Eu149 | 1.314 | ||||||
| Gd150 | 149.9187 | 86 | Syn | 0+ | 1790000y | α | Sm146 | 2.809 | |
| Gd151 | 150.9203 | 87 | Syn | 7/2- | 124d | α | Sm147 | ~8.0E -7 | 2.653 |
| 124d | ε | Eu151 | 0.464 | ||||||
| Gd152 | 151.9198 | 88 | 0.2 | 0+ | 1.08E 14y | α | Sm148 | 2.205 | |
| Gd153 | 152.9218 | 89 | Syn | 3/2- | 240.4d | ε | Eu153 | 0.485 | |
| Gd154 | 153.9209 | 90 | 2.18 | 0+ | Stable | ||||
| Gd155 | 154.9226 | 91 | 14.8 | 3/2- | Stable | ||||
| meta state 0.121MeV | Syn | 11/2- | 31.97ms | IT | 0.121 | ||||
| Gd156 | 155.9221 | 92 | 20.47 | 0+ | Stable | ||||
| Gd157 | 156.924 | 93 | 15.65 | 3/2- | Stable | ||||
| meta state 0.426MeV | Syn | 11/2- | 18.5us | IT | 0.426 | ||||
| Gd158 | 157.9241 | 94 | 24.84 | 0+ | Stable | ||||
| Gd159 | 158.9264 | 95 | Syn | 3/2- | 18.479h | β- | Tb159 | 0.971 | |
| Gd160 | 159.9271 | 96 | 21.86 | 0+ | Stable | ||||
| Gd161 | 160.9297 | 97 | Syn | 5/2- | 3.66m | β- | Tb161 | 1.956 | |
| Gd162 | 161.931 | 98 | Syn | 0+ | 8.4m | β- | Tb162 | 1.390 | |
| Gd163 | 162.934 | 99 | Syn | 5/2- | 68s | β- | Tb163 | 3.100 | |
| Gd164 | 163.936 | 100 | Syn | 0+ | 45s | β- | Tb164 | 2.300 | |
| Gd165 | 164.939 | 101 | Syn | ||||||
| Gd166 | 165.942 | 102 | Syn | 0+ | |||||
| Gd167 | 166.946 | 103 | Syn | ||||||
| Gd168 | 167.948 | 104 | Syn | 0+ | |||||
| Gd169 | 168.953 | 105 | Syn | ||||||
| Nuclide | Potential Parent Nuclides |
|---|---|
| Gd136 | None known |
| Gd137 | None known |
| Gd138 | None known |
| Gd139 | Tb140 (Syn) |
| Gd140 | Dy141 (Syn) Tb140 (Syn) |
| Gd141 | Dy142 (Syn) Tb141 (Syn) Tb141m (Syn) |
| meta state 0.378MeV | None known |
| Gd142 | Dy143 (Syn) Tb142 (Syn) Tb142m (Syn) |
| Gd143 | Dy144 (Syn) Tb143 (Syn) |
| meta state 0.153MeV | None known |
| Gd144 | Tb144 (Syn) Tb144m (Syn) |
| Gd145 | Tb145 (Syn) Tb145m (Syn) |
| meta state 0.748MeV | None known |
| Gd146 | Dy147 (Syn) Dy150 (Syn) Tb146 (Syn) Tb146m (Syn) |
| Gd147 | Dy151 (Syn) Tb147 (Syn) Tb147m (Syn) |
| Gd148 | Dy152 (Syn) Tb148 (Syn) Tb148m (Syn) |
| Gd149 | Dy153 (Syn) Tb149 (Syn) Tb149m (Syn) |
| Gd150 | Dy154 (Syn) Eu150m (Syn) Tb150 (Syn) Tb150m (Syn) |
| Gd151 | Tb151 (Syn) Tb151m (Syn) |
| Gd152 | Eu152 (Syn) Eu152m (Syn) Tb152 (Syn) Tb152m (Syn) |
| Gd153 | Tb153 (Syn) |
| Gd154 | Eu154 (Syn) Tb154 (Syn) Tb154m (Syn) Tb154m1 (Syn) |
| Gd155 | Eu155 (Syn) Tb155 (Syn) |
| meta state 0.121MeV | None known |
| Gd156 | Eu156 (Syn) Tb156 (Syn) Tb156m1 (Syn) |
| Gd157 | Eu157 (Syn) Tb157 (Syn) |
| meta state 0.426MeV | None known |
| Gd158 | Eu158 (Syn) Tb158 (Syn) Tb158m (Syn) |
| Gd159 | Eu159 (Syn) |
| Gd160 | Eu160 (Syn) |
| Gd161 | Eu161 (Syn) |
| Gd162 | Eu162 (Syn) |
| Gd163 | None known |
| Gd164 | None known |
| Gd165 | None known |
| Gd166 | None known |
| Gd167 | None known |
| Gd168 | None known |
| Gd169 | None known |
Key:
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Kenneth Barbalace. Periodic Table of Elements - Gd - Gadolinium. EnvironmentalChemistry.com. 1995 - 2024. Accessed on-line: 4/19/2024
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