One of the radioactive isotopes used in medical treatment or analysis is palladium-103. The half-life of palladium-103 is 17

Question

One of the radioactive isotopes used in medical treatment or analysis is palladium-103. The half-life of palladium-103 is 17 days. How many days is/are required for the activity of a sample of palladium-103 to fall to 12.5 percent of its original value?

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