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We will deal with carbon dating first and then with the other dating methods.

Carbon has unique properties that are essential for life on Earth.

One curie equals thirty-seven billion disintegrations per second, or approximately the radioactivity of one gram of radium.

The change of one radioactive nuclide into a different nuclide by the spontaneous emission of alpha, beta, or gamma rays, or by electron capture.

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

Obviously, this works only for things which were once living.

The radiation of man's natural environment originating primarily from the naturally radioactive elements of the earth and from the cosmic rays.

Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.

This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.

Levels of carbon-14 become difficult to measure and compare after about 50,000 years (between 8 and 9 half lives; where 1% of the original carbon-14 would remain undecayed).

The question should be whether or not carbon-14 can be used to date any artifacts at all? There are a few categories of artifacts that can be dated using carbon-14; however, they cannot be more 50,000 years old.

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