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Message: <blockquote data-quote="topkollek" data-source="post: 29200587" data-attributes="member: 510150">Here's how carbon-14 ends up in our bodies:<ol> <li data-xf-list-type="ol">Formation in the Atmosphere: Carbon-14 is continuously formed in the Earth's upper atmosphere as a result of cosmic rays interacting with nitrogen. When a cosmic ray neutron collides with a nitrogen-14 atom, it creates a carbon-14 atom and a hydrogen atom.</li> <li data-xf-list-type="ol">Incorporation into Carbon Dioxide: The newly formed carbon-14 is oxidized to carbon dioxide (¹⁴CO₂), which gets mixed with the stable isotopes of carbon dioxide (¹²CO₂) in the atmosphere.</li> <li data-xf-list-type="ol">Uptake by Plants: Plants take in carbon dioxide during photosynthesis. As a result, they incorporate both stable carbon (¹²C) and radioactive carbon (¹⁴C) into their tissues.</li> <li data-xf-list-type="ol">Consumption by Animals and Humans: When animals eat plants (or other animals that have eaten plants), they incorporate the carbon from the plants into their own bodies. Similarly, when humans consume plants or animals, they take in carbon, including carbon-14. This is why both plant-eaters and meat-eaters have carbon-14 in their bodies.</li> <li data-xf-list-type="ol">Decay and Replacement: Carbon-14 is radioactive, and over time, it decays back to nitrogen-14 at a known rate (its half-life is about 5,730 years). However, as long as a living organism is consuming food, it's also taking in fresh carbon-14, which replenishes the decaying isotope. When an organism dies, it no longer takes in carbon, and the carbon-14 in its tissues continues to decay without being replaced. This is the basis for carbon dating: measuring the amount of carbon-14 left in a sample can help estimate when the organism died.</li> </ol>In summary, every living organism on Earth, including humans, contains a small but measurable amount of carbon-14, which is continuously replenished throughout its life.</blockquote>

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