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08 Aug

One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.

So, we have a “clock” which starts ticking the moment something dies.

This is because the amount and strength of cosmic radiation entering the earth's atmosphere has varied over time.

That rate can be calibrated by experiment, thus removing one of the main assumptions inherent in most natural dating methods: the composition of the starting material.

This means that although they are very similar chemically, they have different masses.

The total mass of the isotope is indicated by the numerical superscript.

While the lighter isotopes C has decayed that what remains can no longer be measured. In 5,730 years half of the C in the atmosphere, and therefore in plants and animals, has not always been constant.

C) dating usually want to know about the radiometric[1] dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years.