The level has since dropped, as this bomb pulse or "bomb carbon" as it is sometimes called percolates into the rest of the reservoir. Soon after the publication of Libby's paper in Scienceuniversities around the world began establishing radiocarbon-dating laboratories, and by the end of the s there were more than 20 active 14 C research laboratories. Older dates have been obtained by using special sample preparation techniques, large samples, and very long measurement times. ACS Scholars Scholarships for underrepresented minority students majoring in undergraduate chemistry-related disciplines. Three separate laboratories dated samples of linen from the Shroud in ; the results pointed to 14th-century origins, raising doubts about the shroud's authenticity as an alleged 1st-century relic.
Libby died in at the age of
Further results over the next decade supported an average date of 11, BP, with the results thought to be most accurate averaging 11, BP. The currently accepted value for the half-life of 14 C is 5, years. From the measurement performed in the Dead Sea Scrolls were determined to be years old giving them a date of 53 BC, and confirming their authenticity. In any living organism, the relative concentration of carbon — 14 is the same as it is in the atmosphere because of the interchange of this isotope between the organism and the air. The advent of radiocarbon dating may even have led to better field methods in archaeology, since better data recording leads to firmer association of objects with the samples to be tested.