If an iron-59 sample has an initial activity of 160 dpm, how much time is required for
Question:
If an iron-59 sample has an initial activity of 160 dpm, how much time is required for the activity to drop to 20 dpm? (t1/2 = 45 days)
(a) 45 days
(b) 90 days
(c) 135 days
(d) 180 days
(e) 210 days.
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