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12 questions from this quiz
Time for half the nuclei to decay
555 minutes
Very radioactive, quickly dies down
432432432 years
Weak activity, won't need replenishment
Half-life for large sample
Geiger-Muller tube
111 decay per second
160160160 Bq
25%25\%25%
252525 counts/s
Decreases but never reaches zero
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