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It is impractical even for books and papers, so the C14 notation is most commonly used, and we will do the same on this website. But there are three different kinds of carbon, which differ in a way that all are still true carbon, but their atomic structure is different.Two are called C12 and C13, carbon with an atomic weight of twelve or thirteen respectively - which are the normal and stable carbon - and the last one is C14, an isotope of carbon, which is subject to a very slow and harmless radioactive decay.Live on earth is based on carbon, which is gathered from food or from the air.The carbon dioxide is reduced by plants into carbon and oxygen in a process called photosynthesis. In an excavation we often find things which contain some carbon.The C14 is a isotope of carbon, which is otherwise C12 or C13.The C means carbon, the number gives the atomic weight rounded.As far as we can tell, the levels of carbon-14 throughout the world have remained roughly constant throughout the past few millenia, so that when an organism dies and the carbon-14 decays, we can measure how long ago it became deceased by measuring the ratio of carbon-14 to its normal carbon-12.The only major fluctuation we know of occurred when we began detonating nuclear weapons in the open air, back in the mid-20th Century.

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Most of the carbon in our world comes from long-dead stars, in the form of Carbon-12: carbon atoms containing six neutrons in their nucleus.

What could’ve caused an influx of cosmic rays like this?

While there are many possibilities, I wouldn’t count out a relatively nearby, flaring black hole!

From across the galaxy and across the Universe, from stars (including our Sun), pulsars, black holes and more, space is flooded with high-energy particles known as cosmic rays.

Most frequently, cosmic rays are protons, but a handful are heavier ions and a few are even humble electrons.

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