Definition for carbon dating

When organic matter dies it ceases to exchange its carbon, as carbon dioxide, with the atmosphere, so its C14 dwindles by decay and is not replenished.Determination of the radioactivity of carbon from a sample will reveal the proportion of C14 to C12, and this will in turn, through the known rate of decay of C14, give the age of, or more accurately the time elapsed since the death of, the sample.CATEGORY: technique DEFINITION: Any of a serious of methods of analyzing bone samples, especially by measuring fluorine, uranium, nitrogen -- also called the FUN technique -- or by using stratigraphy.

definition for carbon dating-32

SYNONYMS OR RELATED TERMS: radiocarbon dating CATEGORY: technique DEFINITION: The occurrence of natural radioactive carbon in the atmosphere allows archaeologists the ability to date organic materials as old as 50,000 years.

dating technique relies on the progressive decay or disappearance of the radioactive parent with time.

in which the proportion of carbon isotopes is counted directly (as contrasted with the indirect Geiger counter method) using an accelerator mass spectrometer.

The method drastically reduces the quantity of datable material required.

Two things in the method have to be allowed for: first, the 'date' given is never exact.

The /- figure, which should always be quoted, is a statistical one, meaning that there is a 2 to 1 chance that the correct date lies within that bracket.

Variation in the rate of sedimentation sometimes makes the number of years represented uncertain; absolute counts for different samples may therefore not be compatible.

Pollen analysis is then calibrated with SYNONYMS OR RELATED TERMS: Anglian-Elsterian CATEGORY: chronology DEFINITION: Quaternary glacial deposits found in East Anglia, England.

The method yields reliable dates back to about 50,000 bp and under some conditions to about 75,000 bp.

One of the basic assumptions of the technique is that the amount of radiocarbon in the atmosphere has remained constant through time.

Relative dates may be obtained form time-related chemical changes which occur in bone, especially in fluorine, uranium, and nitrogen.

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