Many radioisotopes have important industrial, medical, and research applications

Question

Many radioisotopes have important industrial, medical, and research applications. One of these is 60Co, which has a half-life of 5.20 years and decays by the emission of a beta particle (energy 0.310MeV) 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 13.4 Ci after 35.0 months of use. PART A) If the activity is 13.4 Ci, how many 60Co atoms are in the source? PART B) What is the minimum number of nuclei in the source at the time of creation? PART C) What is the minimum initial mass of 60Co required?

Explanation / Answer

1Ci = 3.7

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