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Cette date est également légèrement antérieure aux premiers essais nucléaires qui ont perturbé la répartition d'isotopes utilisés en radiochronologie, mais aussi aux dates obtenues par d'autres méthodes (thermoluminescence, uranium-thorium, etc.) pour des périodes plus anciennes (Paléolithique inférieur et moyen).

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Nuclei can also decay by capturing one of the electrons that surround the nucleus.

Electron capture leads to a decrease of one in the charge on the nucleus.

Archaeologists generally use this abbreviation to refer to dates that were obtained through the radiocarbon dating technology, although not exclusively; it was certainly made necessary by the quirks of the radiocarbon methodology.

Radiocarbon dating was invented in the late 1940s, and within a few decades, it was discovered that while the dates retrieved from the method have a sound, repeatable progression, they are not a one-to-one match with calendar years.

n'est pas significative par rapport aux marges d'erreurs obtenues pour les périodes en question.

Pour les périodes récentes de la Préhistoire (Épipaléolithique, Mésolithique, Néolithique) et pour les périodes historiques, il est nécessaire de corriger les imprécisions des dates obtenues par la méthode du carbone 14, de les étalonner.

Les résultats bruts des datations par la méthode du carbone 14 sont exprimés en années BP.

Ces résultats ne tiennent pas compte des fluctuations du taux de radiocarbone dans l'atmosphère au cours du temps.

BP was first established as a way to clarify the relationship between calendar years and radiocarbon dates. C., with their explicit references to Christianity, or to use the alternatives C. At the same time, atmospheric nuclear testing, which throws huge amounts of carbon into our atmosphere, was begun in the 1940s.

One advantage to using BP is it avoids the occasionally ire-filled philosophical debate about whether, in this multicultural world of ours, it is more appropriate to use A. Radiocarbon dates after 1950 are virtually useless unless and until we can figure out a way to calibrate for the excessive amount of carbon still increasing in our atmosphere.

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