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However, although 5730 years is the correct half-life, it is not the one used for most C-14 dating, simply because the original half-life used to determine dates back in the 1950s was wrong, and to be consistent we still tend to use the wrong value (a bit like the direction of current flow in electronics, which is the opposite of that which the electrons take, but was the original and incorrect assumption).
The practical range for dating is in the order of a few hundred to about 40,000 years BP.
With the discovery of radiometric dating, it became possible for the first time to attempt precise figures.
Radiometric dating works on the principle that certain atoms and isotopes are unstable.
Some Thermoluminescense dates that are in the order of 50,000 years /- 25,000 years, which with a two standard deviation limit puts it anywhere between yesterday and 100,000 years ago.The radioactive isotope Carbon 14 has a half-life of 5,730 years.