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| half change value; half-life period | |||
| half-life The time required for one-half the atoms of a given amount of radioactive material to undergo radioactive decay | |||
| biological half-life | |||
| elimination half-life; half-life; metabolic half-life; metabolic half-time | |||
| leathré: 8 phrases in 3 subjects |
| General | 3 |
| Natural sciences | 2 |
| Nuclear and fusion power | 3 |