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Plutonium 239 decays exponentially into lead, but it causes concerns for humans because the tiny particles of plutonium react with oxygen and water and can be extremely flammable.

At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.So, the fossil is 8,680 years old, meaning the living organism died 8,680 years ago.Plutonium Plutonium 239 is a man-made radioactive isotope. Plutonium 239 has a half-life of 24,110 years, which means that it would take 240,000 years to decay to a safe amount.With situations involving decay, the rate of growth is always negative.The half-life of a substance is the amount of time it takes for half of that substance to decay.