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The tiny initial amount of C14, the relatively rapid rate of decay (the half-life of C14 is currently about 5700 years) and the ease with which samples can become contaminated make radiocarbon dating results for samples "older" than about 50,000 years effectively meaningless.

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

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Radioactive carbon (Carbon 14) is formed in the upper atmosphere as a byproduct of cosmic radiation.

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.

Most radiocarbon dating labs have liquid scintillation counters for radiometric dating and accelerator mass spectrometers for AMS dating.

The history of radiocarbon dating goes back to 1949, where it was introduced to the world by Willard Libby.

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