Magnetic field and carbon dating

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Lacey Chabert (20)
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About me

Carbon Dating

Wessex Archaeology Cassette tapes or eight-tracks might be the first things that come to mind when thinking about dated magnetic storage, but Bronze Age clay pottery has them both beat. Carbon dating is a widely-used technique for determining the age of archaeological discoveries, but the method only works on artifacts made from carbon-containing organic matter, like wood or cotton. For clay pottery, archaeomagnetic specialist Michele Stillinger of the University of Minnesota, Minneapolis showed that a magnetic method might work. The key is that the clays contain magnetic minerals, like hematite and magnetite. These mineral compasses were pointed in random directions before the pots were put inside a kiln. When the pottery cooled, this alignment was frozen in place, preserving information about the geomagnetic field. Today, Stillinger can take these samples to her lab and reheat them slowly. By applying a well-defined magnetic field, she and her colleagues observe how the compasses within the clay reorient with the new field at different temperatures. Scientists are currently working on plots that show this field strength over the last several millennia in different regions around the globe, but they must incorporate other dating techniques to corroborate their findings.

This is how carbon dating works: Carbon is a naturally abundant element found in the atmosphere, in the earth, in the oceans, and in every living creature. C is by far the most common isotope, while only about one in a trillion carbon atoms is C C is produced in the upper atmosphere when nitrogen N is altered through the effects of cosmic radiation bombardment a proton is displaced by a neutron effectively changing the nitrogen atom into a carbon isotope. The new isotope is called "radiocarbon" because it is radioactive, though it is not dangerous. It is naturally unstable and so it will spontaneously decay back into N after a period of time.

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Carbon 14 is used for this example: This nullifies the carbon method as well as demonstrating that the earth is less than 10, years old. The above is offered as a simple fact of research.

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How Good Are Those Young-Earth Arguments?

Carbon atoms are incorporated into plant tissue by photosynthesis then into animal tissue by ingestion in nearly the same ratio as in the atmosphere. After that, the ratio of 14C to 12C decreases as the radiocarbon decays. The Beta-counting method detects the rate at which purified carbon decays. Libby determined, one gram of pure carbon should produce about 14 However, atmospheric testing of nuclear weapons in the late 's and early 's greatly increased the amount of radiocarbon in the atmosphere, so the decay rate of 14 decays per minute more than doubled.

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