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The date on a coin is an absolute date, as are AD 1492 or 501 in which the proportion of carbon isotopes is counted directly (as contrasted with the indirect Geiger counter method) using an accelerator mass spectrometer.
Dendrochronology, the relationship of dated ancient trees with live trees has no SYNONYMS OR RELATED TERMS: collagen dating CATEGORY: technique DEFINITION: Collagen is a protein abundant in living bone, which contains about 4% nitrogen.
This method yields an absolute date within about 50 years."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.
Human remains may be compared with animal bone or fossils found in the same strata.
Aspartic acid is the compound most often used because it has a of 15,000-20,000 years and allows dates from 5,000-100,000 years to be calculated.
However, racemization is very much affected by environmental factors such as temperature change.
The method is based on the assumption that typologies evolved at the same rate and in the same way over a wide area or alternatively on assumptions of diffusion.