5.78 Cesium-137, used in cancer treatment, has a half-life of 30 yr. (5.2, 5.4) a. Write the balanced nuclear equation for the beta decay of cesium-137. b. How many milligrams of a 16-mg sample of cesium-137 remain after 90 yr? c. How many years are required for 28 mg of cesium-137 to decay to 3.5 mg of cesium-137?

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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.