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What radiation does carbon dating use

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How do scientists figure out how old things are?

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Radioactivity : Carbon

The ability to precisely date, or identify the age of an object, can teach us when Earth formed, help reveal past climates and tell us how early humans lived. So how do scientists do it? Radiocarbon dating is the most common method by far, according to experts. This method involves measuring quantities of carbon, a radioactive carbon isotope — or version of an atom with a different number of neutrons.
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Radiocarbon dating

Technically, all food is slightly radioactive. This is because all food and other organic molecules contain carbon, which naturally exists as a mixture of isotopes, including radioactive carbon However, some foods emit much more radiation than others. Here's a look at 10 naturally radioactive foods and how much radiation you get from them. If there were an award for "Most Radioactive Food," it would go to Brazil nuts.
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In paper mills, the thickness of the paper can be controlled by measuring how much beta radiation passes through the paper to a Geiger counter. The counter controls the pressure of the rollers to give the correct thickness. With paper, or plastic, or aluminium foil, b rays are used, because a will not go through the paper. We choose a source with a long half-life so that it does not need to be replaced often. Even after it has been packaged, gamma rays can be used to kill bacteria, mould and insects in food.
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