For instance, if an object has 50 percent of its decay product, it has been through one half-life.
A popular way to determine the ages of biological substances no more than 50,000 years old is to measure the decay of carbon-14 into nitrogen-14.
This process begins as soon as a living thing dies and is unable to produce more carbon-14.
Plants produce carbon-14 through photosynthesis, while animals and people ingest carbon-14 by eating plants.
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The ratio of the original isotope and its decay product determines how many half-lives have occurred since the sample formed.
A half-life measures the time it takes for one half of a radio isotope's atoms to break down into another element.
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