A 20 kg tumor is being irradiated by a radioactive source, Ask an Expert

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A 2.0 kg tumor is being irradiated by a radioactive source. The tumor receives an absorbed dose of 12 Gy in a time of880 s. Each disintegration of the radioactive source produces a particle that enters the tumor and delivers an energy of 0.40 MeV. What is the activity N//t of the radioactive source?

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