Co-60 is used extensively in radiotherapy as a source of g-rays. Its half-life is 5.27 years. a.
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Co-60 is used extensively in radiotherapy as a source of g-rays. Its half-life is 5.27 years. a. How many years will it take to decrease to 30.0% of its original activity? b. If a cobalt source is ten years old, what percent of its original activity remains?
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