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Polonium-210 decays to the ground state of Pb-206 by the emission of a 5.305-MeV -particle with a half-life of 138 days. What mass of Po-210

Polonium-210 decays to the ground state of Pb-206 by the emission of a 5.305-MeV α-particle with a half-life of 138 days. What mass of Po-210 is required to produce 10 MW of thermal energy from its radioactive decay?

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