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If you ever wondered why nuclear tests are now performed underground, this is why.

Most radiocarbon dating today is done using an accelerator mass spectrometer, an instrument that directly counts the numbers of carbon-14 and carbon-12 in a sample.

Because the cosmic ray bombardment is fairly constant, there’s a near-constant level of carbon-14 to carbon-12 ratio in Earth’s atmosphere.

Organisms at the base of the food chain that photosynthesize – for example, plants and algae – use the carbon in Earth’s atmosphere.

In the end of 1940s, Willard Libby developed the method of carbon dating.

Then the archeologists employed carbon dating as their standard to decide the age of the objects.

A detailed description of radiocarbon dating is available at the Wikipedia radiocarbon dating web page.

This plot shows the level of carbon-14 in the atmosphere as measured in New Zealand (red) and Austria (green), representing the Southern and Northern Hemispheres, respectively.is a term for radiocarbon dating based on timestamps left by above-ground nuclear explosions, and it is especially useful for putting an absolute age on organisms that lived through those events.In The Cosmic Story of Carbon-14 Ethan Siegel writes: The only major fluctuation [in carbon-14] we know of occurred when we began detonating nuclear weapons in the open air, back in the mid-20th century.You have to make sure that the object has the radiocarbon properties or 14 C to find out the age of the object.Here are some interesting facts about carbon dating to note.

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