o-60 is used extensively in radiotherapy as a source of y-rays. Its half-life is 5.27 years. a) How many years will it take to decrease to 35% of its original activity? b) If a cobalt source is ten years old, what percent of its original activity remains?

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Co-60 is used extensively in radiotherapy as a source of y-rays. Its half-life is 5.27 years.

a) How many years will it take to decrease to 35% of its original activity?

b) If a cobalt source is ten years old, what percent of its original activity remains?

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