Turning Back the Clock.

• Autores: J. R. Minkel
• Localización: Scientific American, ISSN 0036-8733, Vol. 290, Nº. 3, 2004, págs. 32-32
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • The article discusses how the decay of radioactive carbon is the chief way to date ancient samples. A group led by Konrad Hughen of the Woods Hole Oceanographic Institution has extended the calibration from 26,000 to the maximum 50,000 years ago (radioactive carbon becomes scarce beyond that age). The researchers matched up radiocarbon-dated layers in marine sediment to annual layers in a Greenland ice core.