Solved: Radioactive isotopes used in cancer therapy have a
Chapter 43, Problem 43.2(choose chapter or problem)
Radioactive isotopes used in cancer therapy have a “shelf-life”, like pharmaceuticals used in chemotherapy. Just after it has been manufactured in a nuclear reactor, the activity of a sample of \({ }^{60} \mathrm{Co}\) is 5000 Ci. When its activity falls below 3500 Ci, it is considered too weak a source to use in treatment. You work in the radiology department of a large hospital. One of these \({ }^{60} \mathrm{Co}\) sources in your inventory was manufactured on October 6, 2011. It is now April 6, 2014. Is the source still usable? The half-life of \({ }^{60} \mathrm{Co}\) is 5.271 years.
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