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Message: <blockquote data-quote="imhotep" data-source="post: 29197337" data-attributes="member: 562115">For this method to work, they would have to eat stuff from earth and be here for long enough time for all of their body cells to be replaced (7 years in a human). Or they would have to come from an environment were the C14/C ratio is exactly as earths...True... There are other factors too. The C14 isn't created at a constant rate. The Solar activity (Cosmic Rays) and also because of the above ground nuclear testing the Earth's atmospheric radiocarbon levels almost doubled from 1955 to 1963. Since then it has dropped back to the previous levels.However there are established methods for applying a correction using a calibration technique. This is where the calBP unit is used. For recent human bodies it's noted that for teeth formed after 1965, enamel radiocarbon content predicted year of birth within 1.5 years.Also modern radio carbon dating uses a different technique - AMS - Accelerator Mass Spectrometry which is an ultra-sensitive analytical technique based on the use of an ion accelerator as a powerful mass spectrometer. The equipment itself is expensive but even a small sample of bone (less than 1 gram) is quite sufficient.</blockquote>

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