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Activity as a Function of Time for a Sample of Barium-137 5 000- 4000 3 000 Activity (counts per minute) 1 000 Time (minutes) 24.

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Activity as a Function of Time for a Sample of Barium-137 5 000- 4000 3 000 Activity (counts per minute) 1 000 Time (minutes) 24. The activity of this sample after 3 half-lives have elapsed is approximately 520 counts/min 2080 counts/min 1900 counts/min O 260 counts/min

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