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Models of uranium-uptake at the early stage and at a constant rate (linear-uptake) were reaxamined for ESR dating of fossil bones and teeth.

An analytical equation for total dose of natural radiation ( is the saturation level of the uranuim and λ is the uranium uptake rate, presumably associated with the decomposition rate of organic materials and the diffusion of uranium.

The radiocarbon method was developed by a team of scientists led by the late Professor Willard F.

Libby of the University of Chicago after the end of World War 2.

We know that it is older than Christendom, but whether by a couple of years or a couple of centuries, or even by more than a millenium, we can do no more than guess." [Rasmus Nyerup, (Danish antiquarian), 1802 (in Trigger, 19)].

The person who wrote these words lived in the 1800s, many years before archaeologists could accurately date materials from archaeological sites using scientific methods.

A tiny part of the carbon on the Earth is called Carbon-14 (C14), or radiocarbon.

Eventually, a particle is emitted from the carbon 14 atom, and carbon 14 disappears.

Most of the carbon on Earth exists in a slightly different atomic form, although it is chemically speaking, identical to all carbon.

After twice that time (about 11000 years), another half of that remaining amount will have disappeared.

After another 5568 years, again another half will have disappeared.

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