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The concept of the universe being speculated as being eons of years old goes all the way back to the Greek philosophers on of Roman times and even earlier than that.
The universe had been accepted as being millions of years old centuries before radiometric dating was invented.
First radiometric methods were invented by Earnest Rutherford in 1905.
Carbon 14 dating specifically was not invented until 1940 by Martin Kamen.
How Carbon 14 gets into samples Carbon 14 is a form of radiometric dating that is unique because it is the only method used to date once living carbon based organisms.Carbon based life forms metabolize carbon and absorb radioactive carbon 14 into their living cells.When the life form dies the metabolism process stops and therefore the remaining radioactive carbon 14 begins to decay.Unknown because clearly these events occurred long before the scientist was even born, and therefore, assumptions must be made to date old samples from an unobserved past.Fossils do not come out of the ground with an age tag telling us how long ago they died.
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What methods do they use and how do these methods work?