Carbon dating study
Stephen covers breakthoughs in science and their impact on society, environment, military, geopolitics, business - pretty much all aspects of life. Stephen is an alumnus of Shantou University, the Hong Kong University of Science and Technology, and the Semester at Sea programme which he attended with a full scholarship from the Seawise Foundation.
In his spare time, Stephen reads and writes novels.
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.
By measuring the remaining amount of carbon-14 in a sample, scientists could estimate the time of death up to 60,000 years ago.
Before that, all traces of radiocarbon would be too small to detect.
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.
“Thus it is necessary to pay [special] attention when using such old carbon data for palaeoclimatic or archaeological interpretations," they added.Based on pottery and architectural signifiers, the heavily fortified structure — and the rest of the Spring Citadel protecting Jerusalem’s precious water source — were dated to Canaanite construction (Middle Bronze II period).In addition to protecting the Gihon Spring, the massive fortification served as a sort of security barrier and permitted one entrance to the spring — “from the west only, from within the city,” according to the City of David website.1700 BCE — and contradict a presumed biblical linkage to the site.Downhill from the Temple Mount of Jerusalem, the Gihon Spring guard tower was discovered in 2004 by archaeologists Ronny Reich and Eli Shukron.