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Physics, 18.09.2019 14:30 fredbear373

Many radioisotopes have important industrial, medical, and research applications. one such radioisotope is 60co, which has a half-life of 5.2 yr and decays by the emission of a beta particle (energy 0.31 mev) and two gamma photons (energies 1.17 mev and 1.33 mev). a scientist wishes to prepare a 60co sealed source that will have an activity of at least 10 ci after 30 months of use. what is the minimum initial mass of 60co required?

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