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Only one out of every trillion carbon atoms is C14. The C14 created in the upper atmosphere reacts with oxygen to become carbon dioxide.The carbon dioxide is absorbed by plants, and the plants are eaten by animals, thus contaminating every living thing on earth with radioactive carbon. As time passes, the C14 in its tissues is converted back into nitrogen.It uses accelerator mass spectrometry to determine the amounts of C14 and C12 in a small sample which is vaporised in the test.The ions produced are forced into a magnetic field where the different mass of the carbon isotopes causes a different deflection, allowing the quantity of each isotope to be measured.The method of radioactive dating used for the Turin Shroud was 'radiocarbon dating' and was invented by Willard Libby. Basis of Radiocarbon Dating Problems with Radiocarbon Dating The Earth's Magnetic Field Table 1 Effect of Increasing Earth's Magnetic Field Removal of Carbon From the Biosphere Water Vapour Canopy Effect on Radiocarbon Dating Figure 1 Apparent Radiocarbon Dates Heartwood and Frozen Time Early Post-Flood Trees Appendix Radiocarbon Date Table HOW ACCURATE IS RADIOCARBON DATING? The normal carbon atom has six protons and six neutrons in its nucleus, giving a total atomic mass of 12.It follows that the older a date is, even within this 'limit', the greater are the doubts about the date's accuracy.

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This limit is currently accepted by nearly all radiocarbon dating practitioners.

Radiocarbon dating can be done at a variety of research institutions including Woods Whole and UC Irvine.

Radiocarbon dating is done in labs with equipment specific to carbon 14 analysis.

This collision is less destructive than the initial collision that produced them.

Usually a proton is knocked out of the nitrogen atom's nucleus and is replaced with the neutron.

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