A 4.3 x 1014 Bq source of 60Co is used for cancer treatment. Each disintegrating nucleus emits two gamma rays, one of energy 1.17 MeV and one of 1.33 MeV. What is the mass of 60Co present in the source? The half-life of 60Co is 5.3 years. Select one: a. 1.04 kg b. 0.010 kg c. 10 kg d. 0.060 kg

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Q: 4.0 m/s

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