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(You can read up on radioactivity and isotopes here).Carbon-14, the radioactive version of carbon, is rare — it only makes up one trillionth of all the carbon in the world.Half-life refers to time it takes for half of the element to decay.This method of dating elements in minerals is commonly used in fields such as geology, archeology and anthropology.Radiometric dating works by determining the ratio of the number of isotopes of an element and the number of isotopes the element it turns into over time.Since the rate at which certain elements decay and turn into different elements is understood, scientists are able to calculate the age of substances.Continue Reading During the formation of the Earth, radioactive elements became embedded in the minerals that make up the Earth's crust.Since many of the minerals seen on a daily basis contain elements that decay over time, scientists can determine the ages of certain types of rocks.

The rate by which these unstable elements decay are generally expressed in terms of half-life.

For a rare event it happens pretty damn often — one million carbon-14 atoms in your body decay into nitrogen every minute!

But don't panic — of the 800,000,000,000,000,000,000,000,000 carbon atoms in every one of us, about 800,000,000,000,000 are carbon-14, so we've got a few to spare.

Radiocarbon dating can easily establish that humans have been on the earth for over twenty thousand years, at least twice as long as creationists are willing to allow.

Therefore it should come as no surprise that creationists at the Institute for Creation Research (ICR) have been trying desperately to discredit this method for years.

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