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As the name suggests, fossil fuel is old, and no longer contains C14.

Both of these man-made changes are a nuisance to carbon dating.

When this was first done, it turned out that carbon dating had been giving too-young dates for early civilizations.

Apparently, the production of C14 by the Sun has changed by several percent across the last 10,000 years.

By looking at the ratio of carbon-12 to carbon-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely. So, if you had a fossil that had 10 percent carbon-14 compared to a living sample, then that fossil would be: t = [ ln (0.10) / (-0.693) ] x 5,700 years t = [ (-2.303) / (-0.693) ] x 5,700 years t = [ 3.323 ] x 5,700 years Because the half-life of carbon-14 is 5,700 years, it is only reliable for dating objects up to about 60,000 years old. It is produced in the upper atmosphere by radiation from the sun.(Specifically, neutrons hit nitrogen-14 atoms and transmute them to carbon.) Land plants, such as trees, get their carbon from carbon dioxide in the air. The same is true of any creature that gets its carbon by eating such plants. Suppose such a creature dies, and the body is preserved.If you hear of a living tree being dated as a thousand years old, that is not necessarily an example of an incorrect dating. Wood taken from the innermost ring really is as old as the tree. We can date things for which historians know a "right answer".And, we can date things that have been dated by some other method.




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Diamond, the third naturally occurring form of carbon, is one of the hardest substances known.


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De Keulse kwestie wordt misbruikt door mensen met een racistische agenda vinden Kristina Lunz en Anne Wizorek. Aan de vrolijke foto die de Volkskrant daarbij afdrukt lijkt het daar in München toch vooral te gaan om Tiroler rokjes die tot ieders jolijt opgetild worden. Zij vindt dat vooral racistische mannen zich nu druk maken om Keulen.