Biology / Bio 0119 · Atom · ~20 seconds
Radioactive Isotopes and Half-Life
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A radioactive isotope decays at a fixed rate; its half-life is the time for half a starting amount to decay.
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Carbon-14 decays to nitrogen-14 with a half-life near 5,730 years, a rate that neither speeds up nor slows down.
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A half-life is a fixed rate, not a countdown to an end date — half of what remains decays in the next half-life.