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Half-life refers to a property of radioactive materials. The half life in the length of time it takes half of the quantity of an element to decay and become a more stable, non radioactive element. So if a 1 kg block of a substance had a half life of 10,000 years, in 10,000 years time there would 0.5 Kg of radioactive material remaining in the block. 10,000 years later there would again only be half as much, so there would then be 0.25 Kg of the radioactive material. Every further 10,000 years the quantity of the remaining radioactive material would half.

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16y ago

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