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13 cards from this deck
Time for half the nuclei to decay OR activity/count rate to halve
Constant
5 min (2 half-lives)
Very radioactive initially, quickly dies down
Short half-life
Weakly radioactive for long period
432 years
Smoke alarms (alpha emitter)
Radiation counts reaching detector per second
Bq (Becquerel): 111 Bq =1= 1=1 decay/second
No, never reaches zero
Geiger-Muller tube (and counter)
Random & unpredictable
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