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“[It] traces its link to atmospheric circulation systems such as the Asian monsoon.” The new finding is important because it aligns with rising concern about the reliability of carbon dating, said Professor Liu Jinyi, specimen curator with the Institute of Vertebrate Palaeontology and Palaeoanthropology in Beijing."Many alternative methods to date objects are now available, but carbon dating is still the most popular because we have used it for a long time with such ease and comfort," said Liu, who was not involved in the study.As scientists who study earth’s (relatively) modern history rely on this measurement tool to place their findings in the correct time period, the discovery that it is unreliable could put some in a quandary.
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"The radiocarbon dating technique may significantly underestimate the age of sediment for samples older than 30,000 years,” said the authors of the report from the Chinese Academy of Sciences and Germany’s Leibniz Institute for Applied Geophysics.
“Thus it is necessary to pay [special] attention when using such old carbon data for palaeoclimatic or archaeological interpretations," they added.
Their work was detailed in a paper in the latest issue of the journal .
For over 50 years, scientists and researchers have relied on carbon dating to find the exact age of organic matter.
He lives in Beijing with a beautiful wife and two lovely kids." data-title="Stephen Chen" data-html="true" data-template=" Radiocarbon dating, which is used to calculate the age of certain organic materials, has been found to be unreliable, and sometimes wildly so - a discovery that could upset previous studies on climate change, scientists from China and Germany said in a new paper.
Their recent analysis of sediment from the largest freshwater lake in northeast China showed that its carbon clock stopped ticking as early as 30,000 years ago, or nearly half as long as was hitherto thought.Prior to that, they had to depend on more rudimentary and imprecise methods, such as counting the number of rings on a cross-section of tree trunk.This all changed in the 1940s when US chemist Willard Libby discovered that carbon-14, a radioactive isotope, could be used to date organic compounds.Some radiometric dating methods depend upon knowing the initial amount of the isotope subject to decay.For example, the C14 concentration in the atmosphere depends upon cosmic ray intensity.But the new study suggests that the sediment might be over 80,000 years old, possibly formed during an ice age.Tags: Adult Dating, affair dating, sex dating