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

Name: 33. Co-60 is used extensively in radiotherapy as a source of ?-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?
Uploaded: 2022-02-13T10:54:36-08:00
Duration: 2 min 30 s
Channel: Ma Ednelyn Lim
Description: 33. Co-60 is used extensively in radiotherapy as a source of ?-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?

Question

Ma Ednelyn Lim · Accepted Answer

Step 1: Calculate the time it will take for Co-60 to decrease to 30% of its original activity.
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Question

33. Co-60 is used extensively in radiotherapy as a source of ?-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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