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There is a suspicion that the relative abundance of carbon-14 could be changing due to the thinning of the ozone layer.

The amount of carbon-14 depends on the amount of radiation permeates the ozone and thus the amount could be changing. Accuracy radioactive dating is called radiometric dating. Radioactive dating of rock samples determines the age of rocks from the time it was formed.

For older items, isotopes of potassium have been used.

PART 1: Back to Basics PART 2: Problems with the Assumptions PART 3: Making Sense of the Patterns This three-part series will help you properly understand radiometric dating, the assumptions that lead to inaccurate dates, and the clues about what really happened in the past.

Carbon dating uses the carbon-14 isotope, with a half life of about 5700 years.

Carbon dating has the peculiar property that it works primarily on dead things.

So that is why carbon-14 is used for radioactive dating.

"Radiometric dating - the process of determining the age of rocks from the decay of their radioactive elements" Wiens, RC 2002, Radiometric Dating A Christian Perspective, 'Science in Christian Perspective', The American Science Affiliation, viewed 8 September 2009, Carbon dating is one type of radiometric dating, there are others.

Yet few people know how radiometric dating works or bother to ask what assumptions drive the conclusions.

So let’s take a closer look and see how reliable this dating method really is.

Other forms of radioactive dating are more broadly applicable.

All living things have carbon in them; but a small amount of that carbon is radioactive. The law of conservation and mass states that matter can not be destroyed nor created.

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