The unstable isotope 234th (Thorium 90) decays by B emission with a half life of 24.5 days. (a) What mass of 234th will

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The unstable isotope 234th (Thorium 90) decays by B emission with a half life of 24.5 days. (a) What mass of 234th will

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The unstable isotope 234th (Thorium 90) decays by B emission with a half life of 24.5 days. (a) What mass of 234th will produce 2.70x10^3 Ci. (b) Where does the energy
come from in radioactive decay?
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