From carbon dating

Rated 4.74/5 based on 775 customer reviews

This is a digitized version of an article from The Times’s print archive, before the start of online publication in 1996.To preserve these articles as they originally appeared, The Times does not alter, edit or update them.Since 1947, scientists have reckoned the ages of many old objects by measuring the amounts of radioactive carbon they contain.New research shows, however, that some estimates based on carbon may have erred by thousands of years.'' But at earlier times, the carbon dates were substantially younger than the dates we estimated by uranium-thorium analysis,'' he said.

from carbon dating-10

from carbon dating-63

Y., reported today in the British journal Nature that some estimates of age based on carbon analyses were wrong by as much as 3,500 years.The best gauge they have found is dendrochronology: the measurement of age by tree rings.Accurate tree ring records of age are available for a period extending 9,000 years into the past.The radiocarbon dating method is based on certain assumptions on the global concentration of carbon 14 at any given time.One assumption is that the global levels of carbon 14 (also called radiocarbon) in the atmosphere has not changed over time.

Leave a Reply