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  2. Radiocarbon dating - Wikipedia

    en.wikipedia.org/wiki/Radiocarbon_dating

    Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby.

  3. Carbon-14 - Wikipedia

    en.wikipedia.org/wiki/Carbon-14

    The inventory of carbon-14 in Earth's biosphere is about 300 megacuries (11 E Bq), of which most is in the oceans. [46] The following inventory of carbon-14 has been given: [47] Global inventory: ~8500 PBq (about 50 t) Atmosphere: 140 PBq (840 kg) Terrestrial materials: the balance; From nuclear testing (until 1990): 220 PBq (1.3 t)

  4. Bomb pulse - Wikipedia

    en.wikipedia.org/wiki/Bomb_pulse

    So in bomb pulse dating it is the relative amount of 14 C in the atmosphere that is decreasing and not the amount of 14 C in dead organisms, as is the case in classical carbon dating. This decrease in atmospheric 14 C can be measured in cells and tissues and has permitted scientists to determine the age of individual cells and of deceased people.

  5. Calculation of radiocarbon dates - Wikipedia

    en.wikipedia.org/wiki/Calculation_of_radiocarbon...

    Since it was produced after the start of nuclear weapon testing it incorporates carbon-14 produced by neutrons in the atmosphere, so the activity is higher than the desired standard, and this oxalic acid, having been produce from beets, had a δ 13 C value of -19.3‰. [9]

  6. Radiometric dating - Wikipedia

    en.wikipedia.org/wiki/Radiometric_dating

    For instance, carbon-14 has a half-life of 5,730 years. After an organism has been dead for 60,000 years, so little carbon-14 is left that accurate dating cannot be established. On the other hand, the concentration of carbon-14 falls off so steeply that the age of relatively young remains can be determined precisely to within a few decades. [13]

  7. Absolute dating - Wikipedia

    en.wikipedia.org/wiki/Absolute_dating

    One of the most widely used and well-known absolute dating techniques is carbon-14 (or radiocarbon) dating, which is used to date organic remains. This is a radiometric technique since it is based on radioactive decay. Cosmic radiation entering Earth's atmosphere produces carbon-14, and plants take in carbon-14 as they fix carbon dioxide ...

  8. Radiocarbon dating considerations - Wikipedia

    en.wikipedia.org/wiki/Radiocarbon_dating...

    C can also be produced at ground level, primarily by cosmic rays that penetrate the atmosphere as far as the earth's surface, but also by spontaneous fission of naturally occurring uranium. These sources of neutrons only produce 14 C at a rate of 1 x 10 −4 atoms per gram per second, which is not enough to have a significant effect on dating.

  9. Cosmogenic nuclide - Wikipedia

    en.wikipedia.org/wiki/Cosmogenic_nuclide

    These nuclides are produced within Earth materials such as rocks or soil, in Earth's atmosphere, and in extraterrestrial items such as meteoroids. By measuring cosmogenic nuclides, scientists are able to gain insight into a range of geological and astronomical processes. There are both radioactive and stable cosmogenic nuclides.