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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)].

Nyerup's words illustrate poignantly the critical power and importance of dating; to order time.

Possible causes for these fluctuations are past variations in climate, in sunspot activity and in geomagnetic field intensity.

There is evidence from archaeomagnetic studies that the latter has been significantly different from its present day value, possibly varying sinusoidally with a maximum about 2000 years ago and a minimum about 6000 years ago.

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.

There are two techniques in measuring radiocarbon in samples—through radiometric dating and by Accelerator Mass Spectrometry (AMS).

radiocarbon dating and methods of low level counting-2radiocarbon dating and methods of low level counting-57

Obviously, this works only for things which were once living.Archaeomagnetism, which is based on the magnetization `fossilized' in clay when it is fired, also provides data on the past secular variation of the geomagnetic direction and to a limited extent this can be used for dating; the geophysical interpretation of the data is also of interest.Thermoluminescence is a fairly recently developed method and the main research emphasis is still concerned with various complications of technique.In addition the following techniques are outlined: potassium-argon dating, uranium series dating (including ionium dating), fission track dating and dating by chemical change (including hydration of obsidian and weathering layers on glass).Some mention of dendrochronology and varve chronology is included in the section on radiocarbon.

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