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It is naturally unstable and so it will spontaneously decay back into N-14 after a period of time.It takes about 5,730 years for half of a sample of radiocarbon to decay back into nitrogen.It takes another 5,730 for half of the remainder to decay, and then another 5,730 for half of what's left then to decay and so on.The period of time that it takes for half of a sample to decay is called a "half-life." Radiocarbon oxidizes (that is, it combines with oxygen) and enters the biosphere through natural processes like breathing and eating.

Astronomers think the moon was born after a Mars-size body (or a series of such big objects) slammed into the early Earth.

But this sediment doesn't typically include the necessary isotopes in measurable amounts.

Fossils can't form in the igneous rock that usually does contain the isotopes.

Some of the isotopes used for this purpose are uranium-238, uranium-235 and potassium-40, each of which has a half-life of more than a million years.

Unfortunately, these elements don't exist in dinosaur fossils themselves.




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Alan Kwan ismoving to Hong Kong to be a professor of finance. Michael Bamberger married his long-time girlfriend, Melissa Ouellette, in New Orleans this past January, joined by many Dartmouth friends from around the country. In May Diana Dinescu graduated from the University of Virginia with a Ph. in clinical psychology and married Bryan Strother the following weekend!


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The former WWE Superstar was scheduled to appear at Stockton Con 2017, an annual pop culture...