Consider a spacecraft’s power source consisting of 210Po, which emits a 5.3-MeV alpha particle, t1/2 = 138 days. (a) How many kg of 210Po are needed to initially produce a power source of 5.0 kW? (b) If the power source must produce 7.0 kW after 2.0 years in space, how much 210Po is needed?
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