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| actinium | |||
| actinium A radioactive element of the actinide series, occurring as a decay product of uranium. It is used as an alpha particle source and in neutron production | |||
| actinium: 58 Phrasen in 3 Thematiken |
| Chemie | 5 |
| Kernphysik | 9 |
| Радиоактивное излучение | 44 |