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12 cards from this deck
Time for half nuclei to decay or activity to halve
Constant
555 min (222 half-lives)
Very radioactive initially, quickly dies down
Weakly radioactive for long period
432432432 years
Smoke alarms (alpha emitter)
Long half-life: won't need replacing; weak activity: not harmful
Number of radiation counts per second
Rate of decay (111 Bq = 111 decay/second)
Never reaches zero
160160160 Bq (252525% of initial)
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