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help please Enter your answer in the provided box. Even though plutonium 239(t1/2=2.41104yr) is one of the main fission fuels, it is still a radiation

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Enter your answer in the provided box. Even though plutonium 239(t1/2=2.41104yr) is one of the main fission fuels, it is still a radiation hazard present in spent uranium fuel from nuclear power plants. How many years does it take for 73% of the plutonium 239 in spent fuel to decay

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