(Solved): The half-life of plutonium- 239 is 24,360 years. If 15g of plutonium is released into the atmosph ...

The half-life of plutonium- 239 is 24,360 years. If $15\mathrm{g}$ of plutonium is released into the atmosphere by a nuclear accident, how many years will it take for $78\%$ of the isotope to decay? It will take years for $78\%$ of the isotope to decay. (Do not round until the final answer. Then round to the nearest year as needed.)