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| |||
| disintegration time; period of decay | |||
| decay period; decay time; disintegration period; transmutation period | |||
| mean life; average life (of a radionuclide or radioactive material); transformation period; decay period; transmutation time; transformation time; lifetime | |||
| Zerfallszeit: 4 phrases in 2 subjects |
| Electronics | 2 |
| Energy industry | 2 |