14.20 60Co is used extensively in medicine as a source of y-rays. Its half-life is 5.27 years. (a) How long will it take a 60Co source to decrease to 18% of its original activity? (b) What percent of its activity remains after 29 months?

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.