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The time depends on the isotope. The half life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years.

The half life is the amount of time during which any given atom of the isotope has a 50% chance of undergoing decay.

Seen another way, the half life is the time it takes for half the atoms of an isotope in a mass of that isotope to undergo decay.

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14y ago
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13y ago

The half-life of a radioisotope is the amount of time it takes for half the sample to decay.

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14y ago

The half-life of a radioisotope is the amount of time it takes for half of the original sample to have fissioned into it's daughter elements.

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12y ago

sample to undergo radioactive decay.

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Q: What is half-life of a radioistope is the amount of time it takes for?
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