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15 cards from this deck
Time for half the nuclei in a sample to decay
Time for activity/count rate to fall by half
Constant
Very radioactive
Weakly radioactive for long period
432 years
Smoke alarms
Alpha
Won't need replenishing, weak activity, not harmful
Number of radiation counts per second
Rate at which a source decays
1 decay per second
No, never reaches zero
Random and unpredictable
Geiger-Muller tube and counter
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