Quotes About Radiocarbon

If one were to rely solely on radiocarbon dating, the whole human world would seem to have started just over 40,000 years ago. Only

Increasingly today, archaeologists are circumventing this problem by a new technique termed accelerator mass spectrometry, which permits radiocarbon dating of tiny samples and thus lets one directly date a single small seed, small bone, or other food residue. In some cases big differences have been found between recent radiocarbon dates based on the direct new methods (which have their own problems) and those based on the indirect older ones.

half of its carbon 14 content decays into nitrogen 14 every 5,700 years, until

A second problem in radiocarbon dating is that the carbon 14 / carbon 12 ratio of the atmosphere is in fact not rigidly constant but fluctuates slightly with time, so calculations of radiocarbon dates based on the assumption of a constant ratio are subject to small systematic errors.

Searching in an ancient rain-fed lake in northern India, paleoclimatologists using radiocarbon dating have discovered that 4,100 years ago, the summer monsoons began a rapid decline. They did not return to normal for two centuries. For an unimaginable two hundred years, the Harappan region saw hardly any rain. Around the same time in China, Egypt, and Mesopotamia, the three other earliest-known civilizations also were lost to the dry sands of history.